Deltana HD security bolts are mounted on the inside of a door or like, allowing extra security at heavy-duty grade while other locks are not in use. Deltana has a proven record for exceptional service and quality and is the architectural hardware manufacturer with the largest inventory selection of architectural and door hardware in America. 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.