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Types of Deadlocks for Doors Hook bolt deadlocks can be installed on narrow stile aluminum storefront sliding doors to increase security and strength of the lock. These locks are locked on both sides to allow greater flexibility in access control. To measure accurately for a new lock, first determine the door's 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 the most sought-after kind of door latch. It's easy and si