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Types of Deadlocks for Doors Hook bolt deadlocks can be installed on narrow storefronts made of aluminum sliding doors to increase lock strength and security. These locks are keyed on both sides for greater flexibility in access control. To accurately measure a new lock to your door, you must first determine the depth of the case (or backset). This is the distance from the edge of the door to the centre of the latch hole. Tubular Latch The tubular latch is the most well-known type of door latch. It's