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Types of Deadlocks for Doors Hook bolt deadlocks are used on narrow stile aluminum storefront sliding doors to increase security and strength of the lock. The locks are double-keyed to give greater flexibility in access control. To accurately measure a new lock to your door, you need to first determine its case depth (or backset). This is the distance from the edge of the door to the centre of the latch hole. Tubular Latch The tubular latch is by far the most well
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