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This is very different from most of the designs available in the market today. When you turn it is feel great because it is ergonomically designed for your fingers. It will 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 be a conversation piece. The functionality is not sacrificed over design.