The Betley Butterfly Round Sprung Mortise internal Door Knobs are a stylish, modern feature of door furniture. They are suitable for all internal wooden door types that only require a Door latch mechanism for opening and closing. Designed for effectiveness, and built to last, these Black nickel door knobs for internal doors add class and style to any interior door as they are universally appealing and aesthetically pleasing. The plating on these handles have mutilple layers of plating to enhance the shine and the polishing is finished off by hand to give that ultimate professional finish. The black layer can be decorative, provide corrosion resistance, ease cleaning procedures, or increase surface hardness . The dimensions of the rose is approximately 56cm, Whether you're a professional tradesman or D I Y enthusiast in hardware for home improvements. They are an essential feature for any door, including modern and traditional homes, offices and shops. The product comes with Spindles and Screws. You will need to buy the internal door latch.