Features: 1.Wide Application: Steering wheel spinner knob is suitable for most cars, trucks, tractors, boats, etc. (Can be installed as long as the size is suitable). 2.Reduced Resistance: Reduce resistance to steering maneuvers, whether it's parking, turning around in alleys or backing up. It's easy to handle it even if you're using it one handed in a crowded space. No more rushing in an emergency. 3.Ergonomic Design: When holding the steering wheel spinner, there is almost no gap between the palm of your hand and the power handle, so that the force is more even. 4.High Class Material: Steering wheel power knob is made of high grade aluminum, which is rust proof, colorfast, strong and durable. 5.Easy to Install: Easy installation, direct replacement of the steering wheel knob, without modification, easy to use and save effort. Specification: Item Type: Steering Wheel Spinner_x000D_ Material: Aluminum_x000D_ Process: Chrome plating_x000D_ Size: Approx. 12 to 40mm/ 0.5 to 1.6in_x000D_ Fitment:_x000D_ For most cars, trucks, tractors, boats (the right size to install)