The Union 2101 5 lever mortice deadlocks are ideal for timber doors hinged on the left or right and the keys are suitable for doors up to 54mm thick.Deadbolt locked or unlocked by the key from either side. The 2101 features an anti-saw deadbolt and is supplied with covered escutcheon to match forend with the striking plate finished to match forend. Deadbolt Brass, with hardened steel rollersRebate Kit 2988 (13, 19 or 25mm sizes)Keying 600 standard differs (keys are not numbered for security purposes) 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. Forend Finish: Brass (Striking Plate Security box type, finished to match forend) Case Size: 77.5mm x 70mm (3 in) Backset: 57mm This is the measurement from the edge of the door to the centre of the keyhole. Pack: Boxed