Inspired by a bullet round. This guitar knob will work for volume and tone controls on your guitar. Because of the shape it is a little short but fits well in your fingers. It is designed to fit any potentiometer up to 1/4" 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.