Latchbolt operated by key from outside and lever handle from inside and deadbolt operated by key from either side using a double cylinder (not supplied) When locked lever handle from inside withdraws both latchbolt and deadbolt. Not suitable for use with turn operated cylinders. Zinc plated case. Pierced to accept 38mm centre bolt through fixing escutcheons and 38mm centre horizontally opposed bolt through fixing furniture. Latchbolt is nickel plated, projection 12mm. Hand must be specified. Deadbolt is laminated nickel plate with a double throw of 12mm/24mm. The measurements are as follows: 90mm(A) comes with backset of 60mm(B) and 72mm(C) centres