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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 locks. The locks are double-keyed to give greater flexibility in access control. To measure accurately for the new lock, first determine the door's case 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 popular kind of door latch. It's easy to install and is a favor