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Types of Deadlocks for Doors Hook bolt deadlocks can be used on storefronts with narrow stiles made of aluminum sliding doors to increase lock strength and security. They are keyed on both sides for greater flexibility in access control. To accurately measure for the new lock, first determine the door's case thickness (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 well-known door latch. It's simple and st