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. Quality metal sheets and rod both threaded and smooth for all for your construction projects. Plated steel has increased resistance to corrosion thanks to its zinc-plated and galvanized finishes. Perforated tubes, slotted flats and angles, smooth rods and threaded rods are among the top popular plated steel products. This galvanized finish offers corrosion resistance for products used where corrosive elements, such as salt air, are present.