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Types of Deadlocks for Doors Hook bolt deadlocks are installed on aluminum sliding narrow stile storefront doors to maximize security and strength of locks. These locks have keys on both sides, allowing for greater flexibility. To accurately measure a new lock for your door, first determine the case's depth (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