5PCS Guitar Pedal Knob Metal 635MM Potentiometer Knob 1/4 Shaft Control Knob Black Aluminum Apilifier Knob with Screw 5PCS Guitar Pedal Knob Metal 6.35MM Potentiometer Knob 1/4 Shaft Control Knob Black Aluminum Apilifier Knob with Screw About this item Metal Made - Black Aluminum guitar pedal knob, with a small slot on top and is filled by white oil as mark to prevent it from being rubbed out after long time use. 6.35MM Shaft - The overall dimension of this amplifier knob is 0.62"x0.5", and the shaft hole size is 6.35MM (1/4"). Set Screw - This potentiometer knobs will also come with set screws and suitable allen wrench for making the control knobs tightly fit on the handles. Application - The 1/4 shaft knob with set screw is suitable for guitar amp, guitar effect pedal, volume knob replacement, etc. What you get - 6 x Metal Dvies Style Knob, 1 x Allen wrench. Feel free to get in touch with us about any issues. _x000D_