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Types of Deadlocks for Doors Hook bolt deadlocks are used on sliding narrow stile aluminum storefront doors to enhance security and strength of the lock. The locks are keyed on both sides for greater flexibility in access control. To measure accurately for the new lock, first determine the door's case depth (or backset). This is the distance between the edge of the front door and the center of the latch hole. Tubular Latch Th
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