Sourcingmap a15112100ux0053 22 mm M4 x 10 mm Round Male Thread Head Knurled Knob Grip - Black (12-Piece) Weight: 65G; product name: round head knob Main material: plastic, metal; package content: 12 x round head knob Main Colour: Black, Silver Tone; Thread Size: 4 x 10mm/ M4 x 0. 4"(D*L) Total height: 22mm/ 0. 87" Head Diameter: 14mm/0. 55"