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Types of Deadlocks for Doors Hook bolt deadlocks can be used on narrow stile aluminum storefront sliding doors to increase lock strength and security. The locks come with keys on both sides that allow for greater flexibility. To accurately determine the size of a new lock for your door, first determine the case's depth (or backset). This is the distance between the edge of the front door and the centre of the latch hole. Tubular Latch The tubular latch is by far the most popular door latch. It's simple and str