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Locks For Doors and Flaps This keyless hook bolt deadlock increases the strength and security of locks for narrow stile aluminum storefront 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 need to measure its'stile'. This is the distance between the edge of the doors and the point at which you can begin any glass, ornamental glass or panels. Hook-type latches with the hook and bracket Locks on doors and flaps should be strong e