1APPLICABLE RANGE: These knob caps are suitable for any guitar or bass with knurled shaft potentiometer with a diameter of 6mm or less, and are suitable for ST style most guitars and bass. 2SIMPLE INSTALLATION: These potentiometer knob caps have a simple structure and are easy to install without the need for fixing screws. Simply push in the compatible potentiometer control knob. 3METAL MATERIAL: These volume tone knob caps are made of excellent metal material, with high hardness, wear resistance, scratch resistance, no deformation, and can withstand long term use. 4REPLACEMENT PARTS: These metal knob caps can directly replace old, damaged, or dirty volume and tone control knob caps, providing stable and reliable instrument performance for you. 5COMPACT AND PRACTICAL: This kit provides 4 pieces metal knob caps, featuring a compact size and lightweight design, easy to install and replace, suitable for electric guitar or bass enthusiasts. 4 xPotentiometer Knob Caps