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Types of Deadlocks for Doors Hook bolt deadlocks are used on sliding narrow stile aluminum storefront doors to enhance lock strength and security. They have keys on both sides to allow for greater flexibility. To accurately measure a new lock, first determine the door's 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 sought-af