Thank you for viewing. This is a set of two aluminum knobs for potentiometers with 0-9 markings, designed for 6mm shafts. They feature a screw that allows for fine adjustment with a flathead screwdriver to secure them to the shaft. These vintage, bizarre-style knobs can be used for volume and tone knobs on electric guitars and basses, as well as for effects pedals, amplifiers, audio equipment, and more. Please confirm the shaft size before purchasing. This product is a set of two knobs. They will be packaged with cushioning material for shipping. Due to the nature of the product, there may be burrs, minor scratches, and scuffs. Thank you for your understanding.