3.5mm stereo plug to 3.5mm stereo jack adapter 3.5mm stereo plug to 3.5mm stereo jack is used to connect 3.5mm stereo jack to a 3.5mm stereo plug connection.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 2: 3.5mm stereo jack body diameter: 10mm