Latchbolt operated by lever handle 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 diagonally opposed bolt through fixing furniture. Latchbolt is brass and reversible; projection is 12mm. Deadbolt is also brass, hook and the throw is 19mm. The measurements are as follows: 63mm(A) lock come with 45mm(B) backset and 48.5mm(C) centres