This knobs was designed for the guitarist or bassist in mind. It has a nice feel. This design will 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 give your guitar or bass a unique look. Upgrade your old knobs with this new and modern design.