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Types of Deadlocks for Doors Hook bolt deadlocks are used on narrow storefronts made of aluminum sliding doors to enhance security and strength of the lock. They 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 from the edge of the door to the center of the latch hole. Tubular Latch The tubular latch is the most sought-after door latch. It's simple and str