? Ergonomic Design: The steering wheel knob adopts a curved concave-convex design, which fits the palm of your hand more comfortably, and the 360-degree steering control can relieve arm pain and neck and shoulder fatigue ? High Quality: The steering wheel knob is made from high quality ABS materials. ? Installation: The power handle mounted on the bearing allows the driver to steer gently when driving slowly and when stopping. Clamp the ring in the appropriate position on the steering wheel. Screw on the bolt to hold the ring securely in place. ? Universality: The steering wheel knob is designed to fit almost all types of vehicles, the knob fits most cars/tractors/lawnmowers, etc ? Safe Driving: The steering wheel booster ball reduces the turning radius and helps drivers to drive safely and conveniently when turning.