Uxcell 10 Pcs Black Silver Tone 16 mm Top Rotary Knobs for 6 mm Dia. Shaft Potentiometer Product name : rotary knob;material : plastic, metal Color : black, Silver Tone;fit for shaft Hole DIA. : 6mm/ 15/64 inch Knob inner DIA : 12mm/ 0.5";knob top diameter : 16mm/0.6" Overall Size : 20 x 12mm/ 0.8" x 0.5"(D*h);weight : 41G Package included : 10 x potentiometer rotary knobs