Uxcell a15050400ux0187 Black M6x15mm Male Thread Screw on Star Head Clamping Knob Grip (5 Piece) Weight: 95G; product Name: Star head knob Main material: plastic, metal; Package Content: 5 x Star head knob Main Color: black, Silver Tone; thread size: 6 x 15mm/ M6 x 0.6"(D*l) Total height: 37mm/ 1.4"; head shape: 5 point Star Star head size: 32 x 11mm/ 1.2" x 0.43"(D*t)