DAIERBUMP 5PCS 635MM Guitar Effect Pedal Knob Metal Potentiometer Knob with Set Screw Guitar Knobs for Electric Guitar Pedal DAIERBUMP 5PCS 6.35MM Guitar Effect Pedal Knob Metal Potentiometer Knob with Set Screw Guitar Knobs for Electric Guitar Pedal About this item Aluminum Made - Aluminum made guitar pedal knobs, with a white line on top to help you easily identify the rotary position. 6.35MM Shaft - The overall dimension of this guitar amp knob is 20 x 14MM, and the shaft hole size is 6.35MM (1/4"). Set Screw - This aluminum potentiometer knob will also come with set screws, which is slotted head design for universal use, will be much more convenient to use. Application - The 6.35MM knob is suitable for electric guitar, potentiometer, effect pedal, etc. What you get - 5 x Effect Pedal Knob with set crew. Feel free to get in touch with us about any issues. _x000D_