Uxcell Potentiometer Control Knob (5 Piece) Product name : potentiometer control knob; knob top diameter : 16Mm/0.63" Knob base diameter : 19Mm/0.74"; shaft insert diameter : 6Mm/15/64" Knob total height : 11Mm/0.43"; material : plastic, metal Main color : Black, Silver tone; weight : 20G Package included : 5 x potentiometer control knob