uxcell 10pcs 6mm Shaft Insert Diameter Black Potentiometer Knobs Caps Product Name : Potentiometer Control Knob;Knob Diameter : 16.5mm / 0.65" Shaft Insert Diameter : 6mm / 15/64";Knob Total Height : 15mm / 0.6" Material : Plastic;Main Color : Black, White, Red Weight : 23g Package Included : 10 x Potentiometer Control Knob