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