It was inspired by gear shifters on race cars. This guitar knob will work for volume and tone control on your guitar. The knob has a unique feel because of the circular shape. It is designed to fit any potentiometer up to ¼” diameter. It is designed to self tap with a 6-32 set screw, if the part is ordered in plastic. If the part is made out of metal you may need a 6-32 tap. This is a great original design that will make heads turn. The functionality is not sacrificed over design.