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Locks For Doors and Flaps This keyless hookbolt deadlock increases the lock strength and security of sliding narrow stile aluminium storefront doors. Its compact design makes it simple to install, and the manufacturer offers a lifetime guarantee on mechanical security. You will need to measure the "stile" of your door before you install a hook-bolt lock. This is the distance between the door's edge and the start of any glass, embedded decoration or panels. Hook-type latches with a bra