Fangrui Product Details 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 Screw Inner Hole Material:copper Product Name:potentiometer Knob Cap Rotation Angle:180 Service Life:about 1,000,000 Times Colour:black Material:aluminum Alloy Package Contents: 15 * 0-100 Scale Sheet 15 * Potentiometer 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.