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Types of Deadlocks for Doors Hook bolt deadlocks can be used on narrow storefronts made of aluminum sliding doors to increase security and strength of the lock. They have keys on both sides, allowing for greater flexibility. To accurately measure a new lock for your door, you need to first determine the case's depth (or backset). This is the distance between the edge of the front door and the centre of the latch hole. Tubular Latch The tubular latch is the most sought-after kind