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Types of Deadlocks for Doors Deadlocks with hook bolts are used on aluminum sliding narrow stile storefront doors to maximize security and strength of locks. The locks are locked on both sides to allow greater flexibility in access control. To accurately measure a new lock, you must first determine the door's case thickness (or backset). This is the distance between the edge of the front door and the centre of latch hole. Tubular Latch The tubular lat