Feature: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information;2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Very solid knob and fits exactly what you are looking for.4.Working great guitar looks awesome with the knows.5.Great replacemences parts for your guitar 6.These dual concentric knobs as used with the dual concentric pot,for achieving 'Tone&Volume' on the same pot Color:ChromeBase one measurement:shaft hole diameter:8mm/0.31inchwidth diameter:18mm/0.71inchheight:12mm/0.47inchTop one measurement:shaft hole diamter:6mm/0.23inchwidth diameter:15mm/0.59inchheight:13mm/0.51inchWeight:1200gPackage Includes: 40 x Chrome Dual Screw style Control Knob