PM322 3 Lever Mortice Deadlock Polished Brass 65mm 2.5in - Yale Locks 650322205025, The Yale PM322 3 lever mortice deadlocks 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 deadlocks also have a 13mm anti-saw deadbolt and have a 10 year guarantee. 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.Finish: Polished Brass Case Size: 79mm x 72mm (3 in) Backset: 57mm This is the measurement from the edge of the door to the centre of the keyhole Yale Locks PM322 3 Lever Mortice Deadlock Polished Brass 79mm 3in