2277 3 Lever Mortice Sashlock Satin Chrome 77.5mm 3in Visi
Case Size 77.5mmBackset: 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. In the UK this is commonly 57mm.Forend Satin Chrome