DC Universal Steering Wheel Spinner Heavy Duty Car /Truck Handle Suicide Power Knob. Made with Alloy bolt and ABS knob with plating Diameter of shift knob: approx. 5.5cm. Universal Fit for the Steering Wheel below Dia. 35mm Can be applied to car & boat & marine steering wheel Brand Trademarks: DC , Record Number: 86526328, more details, please check by uspto gov.