StrongBOLT 2203S 3 Lever Mortice Sashlock Stainless Steel 81mm 3in Visi

Forend finish: Stainless steel.
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.