Whether for home, farm, builder or industrial customers, National has all the right hardware in the sizes and finishes you need. With over a century of service National is committed to maintaining the highest level of product quality, innovation and manufacturing technology. Providing latching and fastening options for all of your indoor and outdoor uses. Wire cable clamps come in a variety of sizes and packing options, including bulk. Zinc plating offers corrosion resistance for all of your functional hardware needs.