1. These knobs are designed to fit a 6mm/0.23Inch shaft hole diameter,making them suitable for a wide range of guitars and basses.2. The screw type design ensures a secure fit and easy adjustment.3. Each knob providing ample for a comfortable grip and precise volume control.4. The classic black color with a silver-tone top adds a stylish touch,enhancing its overall aesthetic while maintaining functionality.5. The set includes 15 potentiometer control knobs and 15 counting scale sheets.Fixed method:side screwInner hole material:copperProduct name:potentiometer knob capRotation angle:180°Service life:about 1,000,000 timesColour:BlackMaterial:Aluminum AlloyPackage Contents:15 * 0-100 Scale Sheet15 * PotentiometerOnly 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.