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Locks For Doors and Flaps This keyless hookbolt deadlock increases the lock strength and security of sliding narrow stile aluminum storefront doors. Its small size makes it easy to install, and the manufacturer offers a lifetime guarantee on mechanical security. To install hook bolt locks on your door, first you must measure its'stile'. This is the distance from the edge of the door to the beginning of any glass panels or embedded decorations. Hook-type latches, which have an attached bracket and hook