UNION StrongBOLT 2100S BS 5 Lever Mortice Deadlock 81mm 3in Satin Brass BoxThe Union 2100S StrongBOLT British Standard 5 lever mortice deadlock is ideal for timber doors hinged on the left or right and they are suitable for doors up to 54mm thick. The 20mm deadbolt is locked or unlocked by the key from either side, and gives a secure positive deadlocking and additional resistance against attack. 2100S features an anti pick, anti saw and anti drill security, chamfered bolt design that increases the performance of the lock