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Types of Deadlocks for Doors Hook bolt deadlocks are used on sliding narrow stile aluminum storefront doors to enhance security and strength of locks. These locks have keys on both sides, allowing for greater flexibility. To accurately measure a new lock to your door, you need to 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 the most well-known door latch. It's easy and simple to install, which makes it a favorite of DIY enthusias