Multipoint Parts Finder Step 2 - Manual Roundbolt
Step 2:
Choose the backset that matches your door. The backset is measured from the edge of the door to center of the lock cylinder as shown in the diagram below.
35mm (1.38") Backset 45mm (1.77") Backset 60mm (2.36") Backset 70mm (2.76") Backset