Latchbolt operated by knob from either side. Deadbolt operated by key from either side using a double cylinder (not supplied) or by key outside and thumb turn inside using a cylinder thumb with turn(not supplied). Pierced to accept 38mm centre horizontally opposed bolt through fixing furniture. Latchbolt is brass and reversible; projection is 12mm. Deadbolt is also brass and the throw is 14mm. 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