The present invention relates to a device (1) for guiding container closures, preferably for feeding crown caps to a closure device (6), comprising a first guide rail (3) extending in a longitudinal direction (2), wherein a second guide rail (4) extending in the longitudinal direction (2) is provided, which is displaceable in the longitudinal direction (2) relative to the first guide rail (3), wherein the first guide rail (3) and the second guide rail (4) form a guide section of
variable length for guiding the container closures, a closure device (6) comprising the device (1), and a
system (8) comprising the device (1) and the closure device (6) for treating containers.