Design: Round Ball StyleMaterial: Stainless steelColor: Neo ChromeSize: 50.9x46.9mm (DxH)Screw adapter: M8, M10 & M12 adaptersUniversal Fit most Japanese & US cars. Does not fit most European cars as they do not have round threaded shiftersInstallation: 1. Remove (twist, unscrew) your old original factory gear knob from shifter shaft.2. Take the screw adapter and attach to the shifter shaft. Place the gear knob directly over adapter and screw until it is tight,3. Once installation is finished, ensure the gear knob is firmly attached to the shifter shaft and the gear shifter is working correctly.