Finish: Polished Chrome
Case Size: 79mm x 101mm (3 in)
Backset: 57mm This is the measurement from the edge of the door to the centre of the keyhole.
Centre: 57mm This is the measurement from the centre of the follower, which operates the handles, to the centre of the keyhole. In the UK this is commonly 57mm.
The Yale PM320 3 Lever mortice sashlocks offer a standard level of security and are suitable for use on internal timber doors. The deadbolt is locked or unlocked by key from either side.
These sashlocks also have a 13mm anti-saw deadbolt, and has been designed for use with door furniture.
A deadlock has a single deadbolt which is locked or unlocked and locked by means of a key from either side, whereas, a sashlock has both a deadbolt and a latch which is operated from either side by a lever handles.
The security level of mortice deadlocks or sashlocks ranges from 2-5 levers. The higher the number of levers the more secure the lock is.