Check the listing for details. 3Pcs Potentiometer Knob Fit 1/4" Shaft Pots, Set Screw Brass Insert, Orange. Condition: New, Made in China. Listed at 21.03 USD. 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: OrangeIn 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.