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Locks For Doors and Flaps This keyless hookbolt deadlock increases the security and strength of sliding narrow stile aluminum storefront doors. Its small size makes it easy to install and the manufacturer gives a lifetime guarantee on mechanical security. You'll need to measure the "stile" of your door before you can install a hook-bolt lock. This is the distance from the edge of the door to the beginning of any panels, glass or embedded decoration. Hook-type latches that have a brack