The Union 2277 3 lever mortice sash locks are ideal for timber doors hinged on the left or right & are suitable for doors up to 54 mm. thick. The deadbolt is locked or unlocked by the key from either side with the latch bolt withdrawn by lever handle from either side. The locks are also pierced to accept bolt through furniture. These locks have a 12.5 mm. anti-saw brass deadbolt with hardened steel rollers & the striking plate is finished to match the forend. Rebate Kit 2969 (13 mm. 19 mm. or 25 mm.). Keying Groups May be supplied to pass differ & keyed alike with 2077 2157 2277 & 2477. Supplied with 2 steel nickel plated keys Keying 100 standard differs (numbers from M101M to M200M)A deadlock has a single deadbolt which is locked or unlocked & locked by means of a key from either side whereas a sashlock has both a deadbolt & a latch which is operated from either side by a lever handle. 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. Case Size 77.5 mm. Backset 57 mm. Forend Brass.