uxcell 5pcs Nonslip Potentiometer Rotary Control Knobs 6mm Shaft Dia Blue Product Name : Potentiometer Knob;Material : Plastic, Metal Color : Black, Blue;Fit for Shaft Hole Dia. : 6mm/ 15/64" Knob Bottom Dia : 19mm/0.7";Knob Top Diameter : 19mm/0.7" Overall Size : 23 x 16mm/ 0.9" x 0.63"(D*H);Weight : 27g Package Included : 5 x Potentiometer Rotary Knobs