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Locks For Doors and Flaps This keyless hookbolt deadlock increases the strength and security of sliding narrow stile aluminum storefront doors. Its compact design is easy to install and comes with a an unbeatable mechanical warranty from the manufacturer. To install a hook bolt lock on your door, you must measure its 'stile'. This is the distance between the door's edge and the point at which you can begin any glass, embedded decoration or panels. Hook-type latches that have an attached bracket an