Check the listing for details. 2Pcs Knurled Shaft Hole Potentiometer Knob Plastic Electric Guitar Knobs. Condition: New, Made in China. Listed at 10.71 USD. Features: Used for Volumes, control knob, guitar Volumes tuning knob. Suitable for easily assembly onto potentiometers, ensuring smoother rotation and enhanced control. It is make of ABS, durability, and can be used for a long time. Easy to install, very enduring, and will not affect the use of your instrument. Great for upgrade or replacement part. Practical replacement knobs are a great gift for those who need knobs. Specifications: Component: ABS and Copper cores Hole Diameter: about 6mm/0.24inch Package Includes: 2pcs Potentiometer Knob note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.