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Types of Deadlocks for Doors Deadlocks with hook bolts are used on sliding narrow stile aluminum storefront doors to increase security and strength of the lock. These locks have keys on both sides, allowing for greater flexibility. To accurately measure a new lock, you must first determine the door'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 the most well-known kind of door latch. It's easy to install, making it a favorite of Joiners and DIY enthusiasts alike. It's