Material: high-quality plastic material, good durability Suitable for metric basins with a diameter of 6mm (approximately 0.24 inches);Compatible with Gibson Epiphone style electric guitar Can replace damaged, messy or old guitar parts with volume control knobs Make your guitar look classic and stand out. Suitable for comfortable wearing in the hand and easy to install. product Product Type: Electric Guitar Knob Hole diameter: 6mm colour: black Material: plastic size: 26x12mm Package Contents: 4xGuitar Knobs Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.