https://www.xaphyr.com/blogs/8....95075/The-Top-Slidin
Types of Deadlocks for Doors Hook bolt deadlocks are used on sliding narrow stile aluminum storefront doors to enhance lock strength and security. They have keys on both sides that allow for greater flexibility. To measure accurately for a new lock, first determine the door's case thickness (or backset). This is the distance from the edge of the door to the center of the latch hole. Tubular Latch The tubular latch is by far the most popular door latch. It is easy to install and is an absolute favorite
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