This knob is totally modern and stylish design. This design will fit any potentiometer up to 1/4" (6.35 mm) diameter. It is designed to self-tap with a 6-32 (M4 X .7)) set screw, if the part is ordered in plastic. If the part is made out of metal you may need a 6-32 (M4 X.7) tap. This is a great original design that will stand out.