Improved grooves in golf club heads

Abstract

To address the necessity for creating a set of clubs capable of producing desirable spin levels when being played in a variety of course conditions throughout the set.SOLUTION: There is provided a set of golf club heads with improved striking surfaces. More specifically, the set of golf club heads includes at least one golf club head in a loft angle range having a first groove type and at least one other golf club head in a different loft angle range having a second groove type. The different groove types based on loft angle ranges provide further predictable spin characteristics throughout the set and further consistent spin performance for various shot conditions.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to clubs, and more particularly to golf club heads with improved striking faces, which include grooves with specific cross-sectional profiles based on the loft of the golf club head. [Background technology]

[0002] Golf club heads come in many different forms and constructions, such as wood or metal types, iron types (including wedge-type golf club heads), utility or specialty types, and putter types, etc. Each of these styles has specific functions and characteristics.

[0003] Iron-type and utility-type golf club heads generally include a front or striking face, a top line, and a sole. The front face is the surface that contacts and strikes the golf ball. To help impart spin to the ball, grooves, also known as "scorelines," may be provided on the face. The top line is generally configured to have a particular appearance to the player and to provide structural rigidity to the striking face. Portions of the face may have areas with different types of surface treatments that extend partially beyond the scoreline area. Some golf club heads have a surface treatment wrap around the top line. The sole of the club is particularly important in golf shots because it contacts and interacts with the ground during the swing.

[0004] In a conventional set of iron-type clubs, each club includes a shaft with a golf club head attached at one end and a grip attached at the other end. The golf club head has a face for striking the club ball. The angle between the face and a vertical plane is called the loft angle.

[0005] An important aspect of golf is being able to generate a desired amount of spin on the ball. It is also desirable to have a predictable spin level for each club in a set. Typically, the higher the loft in a set, the more spin it generates. Shots from longer grass (the "rough") or in wet conditions can experience a significant reduction in spin, resulting in unpredictable ball flight and inconsistent carry distances. The magnitude of the spin reduction is more likely with higher lofted clubs, which can result in "flyers," or balls that fly further than expected, which is problematic when trying to land the ball on the green at a specific distance.

[0006] Additionally, overly aggressive groove profiles can result in excessive spin that can adversely affect ball flight and the interaction between the ball and the green upon landing. A need exists to create a set of clubs that can generate desirable spin levels when played in a variety of course conditions across the set. Summary of the Invention

[0007] The present invention relates to golf club heads that solve the above-mentioned problems. In particular, the present invention relates to golf club headsets with improved groove profiles for different ranges of loft angles. The present invention includes at least a first set of golf club heads intended for slower swing speeds and a second set of golf club heads intended for faster swing speeds. The first set of golf club heads includes at least two different groove profiles: one groove profile for golf club heads with loft angles of 28 degrees or less and a different groove profile for golf club heads with loft angles greater than 28 degrees. The first set of golf club heads has groove profiles designed to help generate more spin regardless of lie conditions while remaining within a specific desired spin level when hit from poor conditions. The second set of golf club heads also includes at least two different groove profiles: one groove profile for golf club heads with loft angles of 31 degrees or less and a different groove profile for golf club heads with loft angles greater than 31 degrees. A second set of sport golf club heads have groove profiles because faster swing speed golf club heads are typically able to generate sufficient ball spin through technique. However, a second set of golf club heads have groove profiles in higher loft golf club heads that balance the desire to reduce spin loss from rough or wet conditions with the desire to prevent excessive spin imparted from fairway or dry conditions.

[0008] In one aspect, the technology described in this disclosure relates to a golf club set, the golf club set including: a first golf club head including: a striking face including a front surface configured to strike a ball; a body extending rearward from the striking face and having a sole, a top line opposite the sole, a heel side, a toe side opposite the heel side, and a hosel on the heel side configured to be attached to a shaft; and at least one groove on the striking face extending in a heel-to-toe direction; and a second golf club head including: a striking face including a front surface configured to strike a ball; and a second golf club head comprising: a body extending rearward from a striking face and having a sole, a topline opposite the sole, a heel side, a toe side opposite the heel side, and a hosel located on the heel side and configured to be attached to a shaft; and at least one groove formed on the striking face and extending in a heel-to-toe direction, wherein the first golf club head has a loft angle of 28 degrees or less and the second golf club head has a loft angle of more than 28 degrees, and the at least one groove of the first golf club head has a cross-sectional profile that is different from the cross-sectional profile of the at least one groove of the second golf club head.

[0009] In one aspect, the technology described in this disclosure relates to a golf club set, the golf club set including: a first golf club head including: a striking face including a front surface configured to strike a ball; a body extending rearward from the striking face and having a sole, a top line opposite the sole, a heel side, a toe side opposite the heel side, and a hosel on the heel side configured to be attached to a shaft; and at least one groove on the striking face extending in a heel-to-toe direction; and a second golf club head including: a striking face including a front surface configured to strike a ball; and a second golf club head comprising: a body extending rearward from a striking face and having a sole, a topline opposite the sole, a heel side, a toe side opposite the heel side, and a hosel located on the heel side and configured to be attached to a shaft; and at least one groove formed on the striking face and extending in a heel-to-toe direction, wherein the first golf club head has a loft angle of 31 degrees or less and the second golf club head has a loft angle of more than 31 degrees, and the at least one groove of the first golf club head has a cross-sectional profile that is different from the cross-sectional profile of the at least one groove of the second golf club head.

[0010] The present invention will now be described with reference to the accompanying drawings. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 shows a golf club head according to the present invention. [Figure 2] FIG. 2 shows a cross-sectional view of the striking face of the golf club head of FIG. 1 taken along the groove. [Figure 3] FIG. 3 shows a preferred groove cutting setup. [Figure 4] FIG. 4 shows a cross-sectional view of the grooves of the golf club head of FIG. [Figure 5] FIG. 5 shows a golf club head according to the present invention. [Figure 6]FIG. 6 shows a cross-sectional view of the grooves of the golf club head of FIG. [Figure 7] FIG. 7 shows a golf club head according to the present invention. [Figure 8] FIG. 8 shows a cross-sectional view of the grooves of the golf club head of FIG. [Figure 9] FIG. 9 shows a golf club head according to the present invention. [Figure 10] 10 is a cross-sectional view of the grooves of the golf club head of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention is directed to a set of golf club heads having different groove profiles for different loft ranges. In one embodiment, the set of golf club heads includes at least a first golf club head 100 having a loft of 28 degrees or less at normal address position and at least a second golf club head 200 having a loft of more than 28 degrees. In another embodiment, the set of golf club heads includes at least a first golf club head 300 having a loft of 31 degrees or less at normal address position and at least a second golf club head 400 having a loft of more than 31 degrees.

[0013] 1-6 illustrate a first golf club head 100 and a second golf club head 200 of a set of golf clubs according to one embodiment of the present invention. The first golf club head 100 includes a body 110 defining a striking face 111, a sole 113, a top line 114 opposite the sole 113, a heel side 115, a toe side 116 opposite the heel side 115, and a hosel 117 on the heel side 115 and configured for attachment to a shaft (not shown). The striking face 111 has a front surface 1111 configured to strike a ball and at least one groove 112. The striking face 111 may be integral with the body 110 or may be a separate component, such as an insert, coupled to the body 110. The first golf club head 100 has a loft angle of 28 degrees or less. The second golf club head 200 includes a body 210 defining a striking face 211, a sole 213, a topline 214 opposite the sole 213, a heel side 215, a toe side 216 opposite the heel side 215, and a hosel 217 on the heel side 215 and configured to attach to a shaft (not shown). The striking face 211 has a front surface 2111 configured to strike a ball and at least one groove 212. The striking face 211 may be integral with the body 210 or may be a separate component, such as an insert, coupled to the body 210. The second golf club head 200 has a loft angle greater than 28 degrees.

[0014] FIG. 2 shows a cross-sectional view of the first golf club head 100 along at least one groove 112. The at least one groove 112 may be machined into the front surface 1111 of the striking face 111. The at least one groove 112 extends in a heel-to-toe direction of the first golf club head 100. The at least one groove 112 is shallow in both the toe and heel portions of the first golf club head 100 and deep in a central region. The at least one groove 112 has a first distance L1 measured along the front surface 1111 of the striking face 111 and a second distance L2 measured along the deepest portion of the at least one groove 112. Thus, the first distance L1 is an overall distance, and the second distance L2 is a maximum depth distance. In one embodiment, the second distance L2 is at least 0.2 inches shorter than the first distance L1.

[0015] The at least one groove 112 may be radiused in the toe and heel portions of the first golf club head 100 or machined into the striking face 111. The first golf club head 100 is held in a mold, and the mold is preferably formed of a material soft enough not to damage the first golf club head 100, yet resilient enough to hold the first golf club head 100 securely. A cutter 130, preferably a round cutter or a saw cutter, may be used to form the at least one groove 112. As shown, the toe and heel portions are radiused about an axis of rotation perpendicular to the longitudinal axis of the at least one groove 112. Furthermore, the axis of rotation is generally parallel to the striking face 111 of the first golf club head 100. A preferred cutter has a diameter of 3 / 8 inch to 3 / 4 inch. Preferred ranges for the groove radius include 0.125 inch to 5 inches, with 0.25 inch to 2.5 inches being more preferred. Having rounded grooves eliminates corners that can trap and facilitate removal of dirt, grass, sand, and other materials that typically get into the grooves of a club during normal use. Figure 3 shows a preferred groove cutting setup showing a cutter 130 having at least one groove 112.

[0016] 4 shows a cross-sectional view of at least one groove 112 of the first golf club head 100. The at least one groove 112 has a first sidewall 1121, a second sidewall 1122, a bottom wall 1123 between the first sidewall 1121 and the second sidewall 1122, a first edge 1125 between the first sidewall 1121 and the front surface 1111 of the striking face 111, and a second edge 1126 between the second sidewall 1122 and the front surface 1111 of the striking face 111. The at least one groove 112 is symmetrical about a longitudinal plane 125 that is equidistant from the first sidewall 1121 and the second sidewall 1122 and extends perpendicular to the front surface 1111 of the striking face 111. The first edge 1125 and the second edge 1126 are each curved and have an edge radius R1. The at least one groove 112 has a width W1 between the first edge 1125 and the second edge 1126. The bottom wall 1123 is spaced a depth D1 from the front surface 1111 of the striking face 111. The at least one groove 112 has a wall angle θ1 defined between the first sidewall 1121 and the longitudinal plane 125.

[0017] The at least one groove 112 of the first golf club head 100 includes a wall angle θ1 between 24 and 32 degrees, more preferably between 26 and 30 degrees, and most preferably about 28 degrees. The wall angle is important for ball spin generation because it affects the amount of wall interaction with the ball and the angle at which the groove edges impact the ball. The at least one groove 112 of the first golf club head 100 has a depth D1 between 0.010 and 0.016 inches, more preferably between 0.013 and 0.015 inches, and most preferably about 0.014 inches. Groove depth is a significant factor in the amount of moisture and debris the ball is exposed to during a shot, and is also an important factor in maintaining the structural rigidity of the striking face. The at least one groove 112 of the first golf club head 100 has a width W1 between 0.025 and 0.030 inches, more preferably between 0.027 and 0.029 inches, and most preferably about 0.028 inches. Groove width affects the spin imparted to the ball by determining the amount of contact area the ball experiences with the striking face surface, the amount the ball can compress between the groove edges, and the number of grooves that ultimately interact with the ball during a shot. Additionally, at least one groove 112 of the first golf club head 100 has a first edge 1125 and a second edge 1126, each having an edge radius R1 of 0.005 inches to 0.009 inches, more preferably 0.006 inches to 0.008 inches, and most preferably about 0.007 inches. The edge radius, along with the wall angle, is important to ball spin generation because it determines the amount of grip the groove edges impart to the ball.

[0018] In one preferred embodiment, the set of clubs includes at least three golf club heads having loft angles of 28 degrees or less and having the same cross-sectional groove profile as described above for the first golf club head 100 .

[0019] 6 shows a cross-sectional view of at least one groove 212 of a second golf club head 200. The at least one groove 212 of the second golf club head 200 has a different cross-sectional profile than the at least one groove 112 of the first golf club head 100. The at least one groove 212 of the second golf club head 200 has a first sidewall 2121, a second sidewall 2122, a bottom wall 2123 between the first sidewall 2121 and the second sidewall 2122, a first edge 2125 between the first sidewall 2121 and the front surface 2111 of the striking face 211, and a second edge 2126 between the second sidewall 2122 and the front surface 2111 of the striking face 211. The at least one groove 212 is symmetrical about a longitudinal plane 225 that is equidistant from the first sidewall 2121 and the second sidewall 2122 and extends perpendicular to the front surface 2111 of the striking face 211. The first edge 2125 and the second edge 2126 are each curved and have an edge radius R2. The at least one groove 212 has a width W2 between the first edge 2125 and the second edge 2126. The bottom wall 2123 is spaced a depth D2 from the front surface 2111 of the striking face 211. The at least one groove 212 has a wall angle θ2 defined between the first sidewall 2121 and the longitudinal plane 225.

[0020] A wall angle θ2 of the at least one groove 212 of the second golf club head 200 is smaller than a wall angle θ1 of the at least one groove 112 of the first golf club head 100. A depth D2 of the at least one groove 212 of the second golf club head 200 is greater than a depth D1 of the at least one groove 112 of the first golf club head 100.

[0021] In one embodiment, the at least one groove 212 of the second golf club head 200 has a wall angle θ2 between 16 and 24 degrees, more preferably between 18 and 22 degrees, and most preferably about 20 degrees. The at least one groove 212 of the second golf club head 200 has a depth D2 between 0.015 inches and 0.020 inches, more preferably between 0.016 inches and 0.018 inches, and most preferably about 0.017 inches. In this embodiment, the width W2 of the at least one groove 212 of the second golf club head 200 is greater than the width W1 of the at least one groove 112 of the first golf club head 100. The at least one groove 212 of the second golf club head 200 has a width W2 between 0.028 and 0.034 inches, more preferably between 0.029 and 0.033 inches, and most preferably about 0.031 inches. Furthermore, at least one groove 212 of the second golf club head 200 has a first edge 2125 and a second edge 2126 each having an edge radius R2 of 0.005 inches to 0.009 inches, more preferably 0.006 inches to 0.008 inches, and most preferably approximately 0.007 inches.

[0022] In another embodiment, the at least one groove 212 of the second golf club head 200 includes a wall angle θ2 between 10 degrees and 18 degrees, more preferably between 12 degrees and 16 degrees, and most preferably about 14 degrees. The at least one groove 212 of the second golf club head 200 has a depth D2 between 0.016 inches and 0.020 inches, more preferably between 0.017 inches and 0.019 inches, and most preferably about 0.018 inches. In this embodiment, the width W2 of the at least one groove 212 of the second golf club head 200 is less than the width W1 of the at least one groove 112 of the first golf club head 100. The at least one groove 212 of the second golf club head 200 has a width W2 between 0.024 inches and 0.028 inches, more preferably between 0.025 inches and 0.027 inches, and most preferably about 0.026 inches. Additionally, at least one groove 212 on the second golf club head 200 has a first edge 2125 and a second edge 2126 each having an edge radius R2 of between 0.006 inches and 0.010 inches, more preferably between 0.007 inches and 0.009 inches, and most preferably about 0.008 inches.

[0023] In a preferred embodiment, the set of clubs includes at least three golf club heads having loft angles greater than 28 degrees and having the same cross-sectional groove profile as described above for the second golf club head 200 .

[0024] 7-10 show a first golf club head 300 and a second golf club head 400 of a set of clubs according to another embodiment of the present invention. The first golf club head 300 includes a body 310 defining a striking face 311, a sole 313, a top line 314 opposite the sole 313, a heel side 315, a toe side 316 opposite the heel side 315, and a hosel 317 located on the heel side 315 and configured to attach to a shaft (not shown). The striking face 311 has a front surface 3111 configured to strike a ball and at least one groove 312. The striking face 311 may be integral with the body 310 or may be a separate component, such as an insert, coupled to the body 310. The first golf club head 300 has a loft angle of 31 degrees or less. The second golf club head 400 includes a body 410 defining a striking face 411, a sole 413, a top line 414 opposite the sole 413, a heel side 415, a toe side 416 opposite the heel side 415, and a hosel 417 on the heel side 415 and configured to attach to a shaft (not shown). The striking face 411 has a front surface 4111 configured to strike a ball and at least one groove 412. The striking face 411 may be integral with the body 410 or may be a separate component such as an insert coupled to the body 410. The second golf club head 400 has a loft angle greater than 31 degrees.

[0025] 8 shows a cross-sectional view of at least one groove 312 of the first golf club head 300. The at least one groove 312 has a first sidewall 3121, a second sidewall 3122, a bottom wall 3123 between the first sidewall 3121 and the second sidewall 3122, a first edge 3125 between the first sidewall 3121 and the front surface 3111 of the striking face 311, and a second edge 3126 between the second sidewall 3122 and the front surface 3111 of the striking face 311. The at least one groove 312 is symmetrical about a longitudinal plane 325 that is equidistant from the first sidewall 3121 and the second sidewall 3122 and that extends perpendicular to the front surface 3111 of the striking face 311. The first edge 3125 and the second edge 3126 are each curved and have an edge radius R3. The at least one groove 312 includes a width W3 between the first edge 3125 and the second edge 3126. The bottom wall 3123 is spaced a depth D3 from the front surface 3111 of the striking face 311. The at least one groove 312 includes a wall angle θ3 defined between the first sidewall 3121 and the longitudinal plane 325.

[0026] The at least one groove 312 of the first golf club head 300 includes a wall angle θ3 between 30 degrees and 45 degrees, more preferably between 34 degrees and 41 degrees, and most preferably about 37.5 degrees. The at least one groove 312 of the first golf club head 300 has a depth D3 between 0.012 inches and 0.019 inches, more preferably between 0.014 inches and 0.018 inches, and most preferably about 0.016 inches. The at least one groove 312 of the first golf club head 300 has a width W3 between 0.028 inches and 0.034 inches, more preferably between 0.029 inches and 0.033 inches, and most preferably about 0.031 inches. Furthermore, the at least one groove 312 of the first golf club head 300 has a first edge 3125 and a second edge 3126 each having an edge radius R3 of 0.0025 inches to 0.0075 inches, more preferably 0.0035 inches to 0.006 inches, and most preferably approximately 0.0047 inches.

[0027] In a preferred embodiment, the set of clubs includes at least three golf club heads having a loft angle of 31 degrees or less and having the same cross-sectional groove profile as described above for the first golf club head 300 .

[0028] 10 shows a cross-sectional view of at least one groove 412 of a second golf club head 400. The at least one groove 412 of the second golf club head 400 has a different cross-sectional profile than the at least one groove 312 of the first golf club head 300. The at least one groove 412 of the second golf club head 400 has a first sidewall 4121, a second sidewall 4122, a bottom wall 4123 between the first sidewall 4121 and the second sidewall 4122, a first edge 4125 between the first sidewall 4121 and the front surface 4111 of the striking face 411, and a second edge 4126 between the second sidewall 4122 and the front surface 4111 of the striking face 411. The at least one groove 412 is symmetrical about a longitudinal plane 425 that is equidistant from the first sidewall 4121 and the second sidewall 4122 and extends perpendicular to the front surface 4111 of the striking face 411. The first edge 4125 and the second edge 4126 are each curved and have an edge radius R4. The at least one groove 412 includes a width W4 between the first edge 4125 and the second edge 4126. The bottom wall 4123 is spaced a depth D4 from the front surface 4111 of the striking face 411. The at least one groove 412 has a wall angle θ4 defined between the first sidewall 4121 and the longitudinal plane 425.

[0029] The wall angle θ4 of the at least one groove 412 of the second golf club head 400 is smaller than the wall angle θ3 of the at least one groove 312 of the first golf club head 300. The depth D4 of the at least one groove 412 of the second golf club head 400 is greater than the depth D3 of the at least one groove 312 of the first golf club head 300.

[0030] The at least one groove 412 of the second golf club head 400 has a wall angle θ4 of 16 degrees to 24 degrees, more preferably 18 degrees to 22 degrees, and most preferably about 20 degrees. The at least one groove 412 of the second golf club head 400 has a depth D4 of 0.015 inches to 0.020 inches, more preferably 0.016 inches to 0.018 inches, and most preferably about 0.017 inches. The at least one groove 412 of the second golf club head 400 has a width W4 of 0.028 inches to 0.034 inches, more preferably 0.029 inches to 0.033 inches, and most preferably about 0.031 inches. Furthermore, at least one groove 412 of the second golf club head 400 has a first edge 4125 and a second edge 4126 each having an edge radius R4 of 0.005 inches to 0.01 inches, more preferably 0.006 inches to 0.009 inches, and most preferably 0.007 inches to 0.008 inches.

[0031] In a preferred embodiment, the set of clubs includes at least three golf club heads having loft angles greater than 31 degrees and having the same cross-sectional groove profile as described above for second golf club head 400 .

[0032] A set of clubs utilizing the groove combinations of the present invention as described above will better maintain proper ball spin progression throughout the set when hitting shots from a variety of lies and moisture conditions.

[0033] Other than in the examples, or unless otherwise expressly stated, all numerical ranges, amounts, values, and percentages in the foregoing portion of this specification, such as amounts of materials, moments of inertia, center of gravity locations, lofts, angles, various ratios, and the like, may be read as if preceded by the word "about," even if the term "about" is not explicitly stated in the value, amount, or range. Accordingly, unless expressly stated to the contrary, the numerical parameters set forth in the following specification and appended claims are approximations that may vary depending upon the desired properties sought to be obtained by the present invention. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should be construed in light of at least the number of reported significant digits and by applying ordinary rounding techniques.

[0034] Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values ​​set forth in the specific examples are reported as precisely as possible. However, any numerical value inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements. Furthermore, when numerical ranges of varying scope are set forth in this disclosure, it is contemplated that any combination of these values ​​inclusive of the recited values ​​may be used.

[0035] While preferred embodiments of the present invention have been described above, it should be understood that they are presented by way of example only, and not limitation. It will be apparent to those skilled in the relevant art that various changes in form and detail can be made therein without departing from the spirit and scope of the invention. Therefore, the present invention should not be limited by the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.

Claims

1. A golf club set, A first golf club head, a striking face including a front surface configured to strike a ball; a body extending rearward from the striking surface and having a sole, a top line opposite the sole, a heel side, a toe side opposite the heel side, and a hosel located on the heel side and configured to be attached to a shaft; a first golf club head including at least one groove on the striking surface extending in a heel-to-toe direction; A second golf club head, a striking face including a front surface configured to strike a ball; a body extending rearward from the striking surface and having a sole, a top line opposite the sole, a heel side, a toe side opposite the heel side, and a hosel located on the heel side and configured to be attached to a shaft; a second golf club head having at least one groove disposed on the striking face and extending in a heel-to-toe direction; the first golf club head has a loft angle of 28 degrees or less; the second golf club head has a loft angle greater than 28 degrees; The set of golf clubs, wherein the at least one groove of the first golf club head has a cross-sectional profile that is different from a cross-sectional profile of the at least one groove of the second golf club head.

2. The at least one groove of the first golf club head comprises: a first sidewall; and a second sidewall; and a bottom wall between the first side wall and the second side wall; a first edge between the first sidewall and the front surface of the striking face; a second edge between the second sidewall and the front surface of the striking face; the at least one groove of the first golf club head is located equidistant from the first sidewall and the second sidewall and is symmetrical about a longitudinal plane extending in the heel-to-toe direction perpendicular to the front surface of the striking face; The at least one groove of the second golf club head comprises: a first sidewall; and a second sidewall; and a bottom wall between the first side wall and the second side wall; a first edge between the first sidewall and the front surface of the striking face; a second edge between the second sidewall and the front surface of the striking face; 2. The set of golf clubs of claim 1, wherein the at least one groove of the second golf club head is located equidistant from the first sidewall and the second sidewall and is symmetrical about a longitudinal plane extending in the heel-to-toe direction perpendicular to the front surface of the striking face.

3. the at least one groove of the first golf club head having a wall angle defined between the first sidewall and the longitudinal plane; the at least one groove of the second golf club head has a wall angle defined between the first sidewall and the longitudinal plane; The set of golf clubs according to claim 2 , wherein the wall angle of the at least one groove of the second golf club head is less than the wall angle of the at least one groove of the first golf club head.

4. The set of clubs according to claim 3, wherein the wall angle of the at least one groove of the first golf club head is between 24 degrees and 32 degrees.

5. The set of clubs according to claim 3, wherein the wall angle of the at least one groove of the second golf club head is between 16 degrees and 24 degrees.

6. The set of clubs according to claim 3, wherein the wall angle of the at least one groove of the second golf club head is between 10 degrees and 18 degrees.

7. 3. The set of golf clubs according to claim 2, wherein the at least one groove of the first golf club head has a depth defined between the front surface and the bottom wall of the striking face; the at least one groove of the second golf club head has a depth defined between the front surface and the bottom wall of the striking face; The set of golf clubs, wherein the depth of the at least one groove of the second golf club head is greater than the depth of the at least one groove of the first golf club head.

8. 8. The set of golf clubs according to claim 7, wherein the depth of the at least one groove of the first golf club head is between 0.010 inches and 0.016 inches.

9. 8. The set of golf clubs according to claim 7, wherein the depth of the at least one groove of the second golf club head is between 0.015 inches and 0.020 inches.

10. 4. The set of golf clubs according to claim 3, wherein the at least one groove of the first golf club head has a depth defined between the front surface and the bottom wall of the striking face; the at least one groove of the second golf club head has a depth defined between the front surface and the bottom wall of the striking face; The set of golf clubs, wherein the depth of the at least one groove of the second golf club head is greater than the depth of the at least one groove of the first golf club head.

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