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Locks For Doors and Flaps This keyless hook bolt deadlock enhances security and strength of the lock for narrow stile aluminum storefront doors. Its compact design makes it easy to install and the manufacturer gives a lifetime guarantee on mechanical security. To install a hook bolt lock on your door, first you must measure its 'stile'. This is the distance from the edge of the door to the top of any glass panels or embedded decoration. Hook-type latch