Deltana is an architectural hardware manufacturer with a proven record for exceptional service and quality. Deltana inventories America's largest selection of architectural and door hardware in over nine fine finishes made from solid brass, zinc, aluminum, steel, and stainless steel. With an array of fine finishes, finding hinges, bolts, bumpers and stops, ball catch, roller latch, door accessories, and home accessories that compliment your home's decor. The door bolts are used to fasten both the lower and upper leaves of any Dutch door.