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Types of Deadlocks for Doors Hook bolt deadlocks are installed on sliding narrow stile aluminum storefront doors to increase security and strength of locks. These locks are keyed on both sides for greater flexibility in access control. To accurately measure a new lock for your door, you must first determine the case's depth (or backset). This is the distance between the edge of the front door and the centre of latch hole. Tubular Latch The tubular latch is by far the most sought-after door latch. It's eas