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Types of Deadlocks for Doors Deadlocks with hook bolts are used on aluminum sliding narrow stile storefront doors to enhance security and strength of locks. These locks are keyed on both sides for greater flexibility in access control. To accurately measure for the new lock, first determine the door's case thickness (or backset). This is the distance between the edge of the front door and the center of the latch hole. Tubular Latch The tubular latch is the most sought-after kind of door latch. It's easy to install and a favorite of DIY enthusiasts and Joiners ali