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Types of Deadlocks for Doors Hook bolt deadlocks can be installed on storefronts with narrow stiles made of aluminum sliding doors to enhance security and strength of locks. They are double-keyed to give greater flexibility in access control. To accurately measure for a new lock, you must first determine the door's case depth (or backset). This is the distance between the edge of the front door and the centre of latch hole. Tubular Latch The tubular latch is the most sought-after door latch. It'