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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. They have keys on both sides, allowing for greater flexibility. To accurately determine the size of a new lock for your door, first determine the depth of the case (or backset). This is the distance from the edge of the door to the center of the latch hole. Tubular Latch The tubular latch is the most popular type of door latch. It's e