1、GUITAR ACCESSORIES: GD139 is perfectly crafted sunflower guitar knobs with no burrs or incisive edges, central hole diameter is approximately 6.8mm, suitable for most electric guitars 2、METAL MATERIAL: Electric guitar knob is made of excellent quality, full metal construction without any plastic components, ensuring a smooth adjustment experience 3、VERSATILE USAGE: Top hat knobs are designed for adjusting volume, tone, and pitch, allowing players to customize their electric guitar sound based on their preferences or needs 4、EASY INSTALLATION: Come in a pack of 3 electric guitar dome knobs with a small wrench included, making it convenient for guitarists to replace and install the knobs 5、UNIVERSAL COMPATIBILITY: Metal potentiometer knobs is compatible with a wide range of electric guitars, offering a reliable and long lasting option for adjusting sound parameters Item Type: Electric Guitar Knobs Material: Metal Use: Used for adjusting volume, tone, and pitch on electric guitars. They can adjust various parameters, allowing the player to customize the sound of the electric guitar Central Hole Diameter: Approx. 6.8mm / 0.27in 3 x Electric Guitar Knobs 1 x Wrench