Features: Great replacement parts for electric guitar parts to replace your broken, dirty or old volume tone control knob. Made of quality ABS material, durable and fashion. Unique speed control knob printed with number. Give your guitar a special look. Appearance Size: small diameter: 17mm, Large diameter: 25.5mm. Mounting inner hole diameter: 4.5mm/0.18in. And easy to install. Applicability: Compatible with most bass or electric guitars. Specifications: Material: ABS Color: As The Picture Shows Package Weight: approx.12g Size: approx.2.55x2.55x1.37cm/1.00x1.00x0.54in (More Size Detail, Please See Photo.) Note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the differences between different monitors, the picture may not reflect the actual color of the item. Thanks! Package includes: 1 Set of Guitar Speed Control Knobs