Description Features: It is make of plastic material, durability, and can be used for a long time. Suitable for effect pedals or amplifiers. Suitable for most Split shafts/Solid shafts or D shafts potentiometers without any drilling. Easy to install and use, just insert the pedal head into the hole of the guitar potentiometer and tighten the screw. Great for upgrade or replacement part. Specifications: Material: Plastic Size: As shown in the picture Note: Please allow 1-2cm errors due to manual measurement, make sure that you not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 5pcs Effect Pedal Knobs