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Types of Deadlocks for Doors Hook bolt deadlocks can be used on storefronts with narrow stiles made of aluminum sliding doors to increase security and strength of the lock. These locks are double-keyed to give 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 centre of the latch hole. Tubular Latch
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