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Types of Deadlocks for Doors Hook bolt deadlocks can be installed on narrow stile aluminum storefront sliding doors to enhance security and strength of the lock. The locks 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 from the edge of the door to the center of the latch hole. Tubular Latch The tubular latch is the most popular door latch. It's simple to install and popular with DIY enthusiasts and