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Types of Deadlocks for Doors Deadlocks with hook bolts are used on sliding narrow stile aluminum storefront doors to enhance lock strength and security. These locks are locked on both sides to allow greater flexibility in access control. To measure accurately for the new lock, first determine the door's depth (or backset). This is the distance between the edge of the front door and the center of latch hole. Tubular Latch The tubular latch is the most popular type of door latch. It's easy and simple to insta