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Types of Deadlocks for Doors Hook bolt deadlocks are installed on aluminum sliding narrow stile storefront doors to enhance lock strength and security. They are double-keyed to give greater flexibility in access control. To accurately measure a new lock for your door, 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 popular kind of door latch. It's simple to install and is popular with DIY enthusiasts and joiners alike. It is av