What is this?Great replacement for guitar amps and pedals. Widely use for guitar effect pedal knobs, amplifier control knobs, guitar parts accessories, and for controlling the effect of a variety of functions, such as level, speed, voice, etc.What will I get?Material: plasticHeight: 12mm/0.47"Base Diameter: 20mm/0.79"Fits 6.4mm/0.25" diameter potsColor: TransparentIn the package of 3pcs knobs for effect pedals or amplifiersAre there any advantages of the product?Well-made, durable, and sturdy, plastic control knob to be assembled to a potentiometer for easier rotation. Made of ABS plastic, the surface is smooth and feels comfortable, and there is a set screw brass insert to fix the installation more firmly.How to use it?Easy Installation: Press the knob to tighten fit snugly for a secure fit.