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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 the lock. These locks are double-keyed to give greater flexibility in access control. To accurately measure a new lock for your door, you must first determine its 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 sought-after door latch. It's easy and simple t