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Locks For Doors and Flaps This keyless hook bolt deadlock maximizes lock strength and security for sliding storefront aluminum doors. Its compact design makes it easy to install and comes with a a lifetime mechanical warranty from the manufacturer. To install hook bolt locks 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 decoration. Hook-type latches featuring a hook and bracket Locks on doors and flaps must be strong enough to prevent unauthorized