As its name indicates, a spinner knob resembles those units found on many doorways. They are easy to grip and operate upon; therefore, you can find them on various utility and farming vehicles. Their primary purpose is to ease driving and help drivers with health issues drive efficiently and better. They also increase the control and stability of vehicles. In addition, they help you maneuver the vehicles better on all limited surfaces, roads, and terrains. However, they're known as suicide knobs as they may catch clothing and cause a loss of control.