Forend Finish: Brass (Striking Plate Security box type, finished to match forend) Case Size: 67mm x 111mm (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. Pack: Boxed