1PCS Electric Guitar Volume Tone Control Knobs Dual Concentric Dome Knobs Features: Dual knurled concentric knobs made with durable metal material To be used with the dual concentric Pot Control the Tone & Volume on the same Pot Compatible with most electric guitars and bass guitar. Base one size: Approx. 18 * 12.5mm / 0.7 * 0.5in (D * H) Base one inner hole diameter: approx. 8mm / 0.31in Top one size: Approx. 15 * 14mm / 0.59 * 0.55in Top one inner hole diameter: Approx. 6mm / 0.24in Color: Gold/Silver/Black Package Include: 1pcs dual control knobs Note: 1cm=10mm=0.39inch No retail package. Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!