1、Wide Compatibility: This speed control knob is compatible with most electric guitars. It is a good DIY product for instrument lovers. 2、Metal Material: Made of premium metal material, this knob is strong and sturdy, ensures long life span and fine using experience. 3、Fine Workmanship: This knob is well made with delicate and flat appearance, which is not only a control for your guitar, but also a fine decoration. 4、Easy to Install: Comes with a compact size and a light weight as well, the easy installation can be quickly completed. 5、Ideal Replacement: This potentiometer knob can be easily installed, ideal replacement for the old and damaged parts. 4 x Potentiometer Knob Item Type: Potentiometer KnobMaterial: MetalExternal Size: Diameter Approx. 18.4mm / 0.72in, Height Approx. 17.8mm / 0.7inInstallation Size: Corresponding potentiometer installation inner hole diameter Approx. 6mm / 0.24in