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Types of Deadlocks for Doors Deadlocks with hook bolts are used on aluminum sliding narrow stile storefront doors to increase security and strength of locks. They have keys on both sides to allow for greater flexibility. To accurately measure for a new lock, you must first determine the door's case thickness (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 the most popular door latch. It's