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Types of Deadlocks for Doors Hook bolt deadlocks are used on narrow storefronts made of aluminum sliding doors to enhance lock strength and security. They are locked on both sides to allow greater flexibility in access control. To measure accurately for the new lock, first determine the door's case thickness (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 t