Uxcell a13041000ux0108 Silver Tone Top Rotary Knobs for 6 mm Dia. Shaft Potentiometer, 10 Piece, 19 mm, Black Product Name: Rotary Knob; Material: Plastic, Metal Color: Black, Silver Tone; Fit for Shaft Hole Dia. : 6mm/ 15/64" Knob Inner Dia: 15mm/ 0. 6"; Knob Top Diameter: 19mm/0. 7" Overall Size: 23 x 12mm/ 0. 9" x 0. 5"(D*H); Weight: 55g Package Included: 10 x Potentiometer Rotary Knobs