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Types of Deadlocks for Doors Hook bolt deadlocks are used on narrow storefronts made of aluminum sliding doors to increase security and strength of locks. The locks are keyed on both sides for greater flexibility in access control. To accurately measure a new lock for your door, you need to first determine the depth of the case (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 the most well-known kind of door latch. It's easy to install, w