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