These locks can be locked with a key, but we also have magnetic locks, residential building locks, black locks, ...
When choosing a lock, pay close attention to the dimensions of the counter plate, the axle size and the mandrel.
These are the 3 most important dimensions that you must take into account.
Axle size = middle square hole for the pin of the door handle to the middle of the lower opening (key, cylinder or toilet).
Mandrel = the distance from the counter plate to the center of the square hole of the door handle