Yale locks, or cylinder night latches, are a quick and convenient way to lock a door for low security and/or short term purposes. The door is locked by simply pulling the door shut, rather than using a key. The keying and/or finish can be easily changed by replacing just the cylinder, rather than the whole lock.
Euro-profile locks are used as an alternative to mortice locks, mostly on uPVC doors. Like Yale locks, the keying can be easily changed by replacing just the cylinder