KAISH 10pcs Aged White Mini MXR Style Skirted AMP Knob Brass Insert Effect Pedal Knobs Guitar Amplifier or Effect Pedal Knobs Dimension: 11.3mm (height) x 14.8mm (Top diameter) x 20mm (Base diameter); Made of plastic with Set screw and Brass Insert; Fits 1/4" (6.35mm) diameter shaft pots Please be sure to verify the dimensions before you order the knobs