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Types of Deadlocks for Doors Deadlocks with hook bolts are used on aluminum sliding narrow stile storefront doors to maximize lock strength and security. The locks are double-keyed to give greater flexibility in access control. To measure accurately for the new lock, first determine the door's case depth (or backset). This is the distance between the edge of the front door and the centre of the latch hole. Tubular Latch The tubular latch is the most well-known door latch
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