3.5mm stereo plug to 6.35mm stereo jack adapter 3.5mm stereo plug to 6.35mm stereo jack converts 6.35mm stereo plug to a 3.5mm stereo plug.The adapter is assambled of black molded plastic with nickel-plated contacts.Black molded plastic construction nickel-plated contacts connector 1: 3.5mm stereo plug connector 1: 6.35mm stereo jack external length / height: 53.9mm body diameter: 11mm