StrongBOLT 2203S 3 Lever Mortice Sashlock Polished Brass 81mm 3in Visi
Forend finish: Polished brass. Case size: 81 x 109.6mm. Backset: 57mm. This is the measurement from the edge of the door to the centre of the keyhole.Centre: 57mm. This is the measurement from the centre of the follower, which operates the handles, to the centre of the keyhole.