Mounted on the rim of the wheel, the independently rotating Steering Wheel Spinner: Knob-Type is designed to provide added strength and control when driving with one hand. It's intended for use primarily by an individual who has full use of hand and wrist of one arm. On self-propelled farm equipment, the device helps the driver steer with one hand while operating various controls with the other, to more accurately guide the machine (plus any trailing implement) when backing up, and to make frequent, sharp turns (e.g., as with a skid steer, fork truck, or riding mower).