6PCS 635MM Potentiometer Knob Metal Silver Guitar Pedal Knobs 1/4 Shaft Silver AMP Knobs with Set Screw Guitar Knobs 6PCS 6.35MM Potentiometer Knob Metal Silver Guitar Pedal Knobs 1/4 Shaft Silver AMP Knobs with Set Screw Guitar Knobs 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 0.49"x0.49", 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 - 6 x Effect Pedal Knob with set crew. Feel free to get in touch with us about any issues. Slotted Set Screw The set screw for this potentiometer knob is slotted head design, which is common type and more convenient tighten by tools. Metal Made The guitar pedal knob is aluminum made, which is durable to use. With a white line on the top to help with easily identifying the rotary position. Wide Application This guitar amp knob is 6.35MM shaft design, with set screw to tightly fit on devices, suitable to be used as control knobs for guitar effect pedal, amplifier, etc. _x000D_