Brass insert and set screw; fits US size 1/4" (6.35mm) diameter pots. 2 Large Knobs Dimensions: 23.4mm(base diameter) x 17.2(top diameter) x 15.5(height) (please check the dimensions carefully before ordering). 1 Small Knob Dimensions: 20.2mm(base diameter) x 15(top diameter) x 11.5(height) (please check the dimensions carefully before ordering). Please note that this is not the original Jazz Bass Knobs, so the dimensions are slightly different from the original Jazz Bass Knobs; please be sure to check the dimensions before ordering.
