StrongBOLT 2200S BS 5 Lever Mortice Sashlock Satin Chrome 68mm Box

Finish: Satin Chrome

Case Size: 68mm x 109.6mm (2.5in)

Backset: 45mm 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.
Boxed