Uxcell 5 Pcs Black Silver Tone 30 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 : 26mm/ 1.4";knob top diameter : 30mm/1.2" Overall Size : 33 x 16mm/ 1.3" x 0.6"(D*h);weight : 62G Package included : 5 x potentiometer rotary knobs