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 quality hinges for all of your industrial, residential, commercial and specialty needs. With a wide array of finishes and corner options, there's a residential hinge application ideally suited to fit your interior project needs. Smooth black finish with excellent corrosion resistance because they are triple-protected with zinc-plate, black chromate dip and black baked on enamel finish.