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Locks For Doors and Flaps This keyless deadlock is designed to maximize the strength and security of sliding narrow stile aluminium storefront doors. Its small size makes it easy to install and the manufacturer provides an unbeatable mechanical guarantee for the life of the product. To install a hook bolt lock on your door, first you must determine its 'stile'. This is the distance from the edge of the door to the beginning of any glass, panels or embedded decorations. Hook-type latches t