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Types of Deadlocks for Doors Hook bolt deadlocks can be installed on narrow stile aluminum storefront sliding doors to enhance lock strength and security. The locks come with keys on both sides, allowing for greater flexibility. To accurately determine the size of a new lock for your door, first determine its case depth (or backset). This is the distance between the edge of the front door and the center of the latch hole. Tubular Latch The tubular latch is the most popular kind of door latch. It's easy and simp