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Types of Deadlocks for Doors Deadlocks with hook bolts are used on sliding narrow stile aluminum storefront doors to increase security and strength of the lock. They have keys on both sides that allow for greater flexibility. To accurately determine the size of a new lock for your door, you need to first determine its case depth (or backset). This is the distance between the edge of the front door and the center of the latch hole. Tubular Latch The tubular l