DC Suicide Knob Handle Power Steering Wheel Ball Spinner for Car Boat Marine. (Black) Impact Resistant Plastic Knob + Stainless Steel Metal Clamp Diameter of Clamp: 3.3-3.6cm (approx) Can be applied to car & boat & marine steering wheel Steering Wheel Knob: 5.5cm Brand Trademarks: DC , Record Number: 86526328, more details, please check by uspto gov.