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Types of Deadlocks for Doors Hook bolt deadlocks can be installed on narrow stile aluminum storefront sliding doors to increase security and strength of locks. They have keys on both sides that allow for greater flexibility. To accurately measure a new lock to 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 by far the most popular door latch. It's simple and str