The union 5 lever bs mortice deadlock 795mm is ideal for external timber doors hinged on the left or right with the keys being suitable for doors up to 54mm thick the deadbolt is locked or unlocked by the key from either side and a 20mm deadbolt for secure positive deadlocking and additional resistance against attack features an anti pick anti saw and anti drill security chamfered bolt design that increases the performance of the lock under side load testing the chamfer of the bolt also ma