4pcs Metal Electric Bass Guitar Volume Tone Control Knobs Dome Knobs Guitar Parts with Hole Features: 100% brand new and high quality. With 2mm inner hexagonal screw hole. It is suitable for most Electric guitar, electric bass. Specification: Material: Metal Color: Black Small diameter: approx. 18-18.5mm/0.7-0.72''(Silver Black diameter approx. 18mm, gold diameter approx. 18.5mm) Height: approx. 19mm/0.7'' Pots of hole: approx. 6mm/0.23'' Quantity: 4pcs Net weight: approx. 86g Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding.