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