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Types of Deadlocks for Doors Hook bolt deadlocks are used on sliding narrow stile aluminum storefront doors to maximize lock strength and security. The locks are keyed on both sides for greater flexibility in access control. To accurately measure a new lock, you must first determine the door's case 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 type of door latch. It's eas