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Commercial Cylindrical Lever Door Lock Selector Tool

Choose Lock Backset

Backset: Is the distance from the end of the door to the center line of the lockset hole. The best way to measure the backset is to remove the existing lock. Then mark a center line on the lockset hole with a pencil. Using a tape measure carefully measure the distance from the center line mark to the end of the door where the latchbolt would be.

2-3/4" Backset: This is the most common door lock backset. It is typically found on all commercial doors.

2-3/8" Backset: This backset is not as common, however can be found on residential doors.