Latchbolt operated by knob from either side. Deadbolt operated by key from either side. Pierced to accept 38mm centre horizontally opposed bolt through fixing furniture. Latchbolt is brass and reversible; projection is 12mm. Deadbolt is also brass with two hardened steel rollers and the throw is 16mm. The measurements are as follows: 127mm(A) lock comes with 45mm(B) backset and 57mm(C) centres, 151mm(A) lock comes with 57mm(B) backset and 70mm(C) centres. 200 standard differs numbered 001-200. If you are choosing the master keyed lock then these are available in master, sub and grand master keyed