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Types of Deadlocks for Doors Hook bolt deadlocks are used on sliding narrow stile aluminum storefront doors to increase security and strength of the lock. They have keys on both sides that allow for greater flexibility. To accurately measure 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 sought-after type of door latch. It's easy to i