A container-handling installation includes an exchangeable format part for guiding containers, and a catch closure for connecting the format part in a releasable manner to a locking device. The catch closure has a catch on an upper format plane. The catch rotates between a first, in which it releases the format part, and a second position, in which it locks it. The catch closure fixes and braces the format part and locking device, which is oriented around the catch closure, has a vertical web with a locking tab corresponding to the catch. A connecting device arranged on a side of the locking device opposite the locking tab fixes the locking device to a body of the container-handling installation.