Whether for home farm builder or industrial customers National has all the right hardware in the size 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. Thanks to a proprietary WeatherGuard finish zinc plated eye U-bolts and turnbuckles last three times longer than the competition. Continued expansion of stainless steel bolts including heavy-duty applications put us well ahead of the competitors. Zinc plating offers corrosion resistance for all of your functional hardware needs.