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Locks For Doors and Flaps This keyless hook bolt deadlock increases the strength and security of locks for sliding storefront aluminum doors. Its compact design makes it simple to install and the manufacturer gives a lifetime mechanical guarantee. You'll need to determine the'stile ' of your door before installing hook-bolt locks. This is the distance from the edge of the door to the beginning of any glass, panels or embedded decoration. Hook-type latches, which have the hook a