Car steering knobs for drivers and fits standard steering wheels with a width of 26 mm ( 1 inch) or less and a depth of 36 mm (1.4 inch) or less. The knob fits car / boat / tractor / mower. But if you have installed a steering wheel cover, the steering wheel knob may not fit anymore. | The power steering wheel handle is comfortable for driver and this steering wheel accessories for car and boats.The power handle has a plastic gasket, please use it effectively; If driving becomes difficult (eg.Pain in arms, shoulders, back) Please use Hypersonic steering wheel knob to relieve your pain and fatigue. | The grip design of suicide spinner knob, when holding the knob, there is almost no gap between your palms and power handle, so that the effort force is more average. Assembly is simple, all required tooling is provided. | This steering wheel spinner really goes well with most car / . It is also able to reduce the driver's uncomfortable because of the long time driving. Hypersonic car power handle is suitable for long time driver. Please don't forget to measure your steering wheel before buying. | Car steering wheel knob reduce the resistance of steering to manipulate, no matter parking, small alley U-turn or back your car. It is easily to handle it, even though you use the driving handle knobs by single hand in a crowded space. The knobs must be installed on the steering wheel without the steering wheel cover. If it is installed on the cover, it will be very tight and unusable.