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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 the lock. They are double-keyed to give greater flexibility in access control. To measure accurately for a new lock, first determine the door's depth (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 well-known type of door latch. It's easy to install, making it a popular choice for Joiners and DIY ent