uxcell 50mm Plastic Star Head M10x20mm Male Thread Clamping Knob Grips 4pcs Product Name: Clamping Knob; Type: Screw On Head Diameter: 50mm / 2"; Male Thread Diameter: 10mm/ 0.4" Thread Length: 20mm / 0.8"; Total Height: 45mm/ 1.8" Main Color: Black; Material: Metal, Plastic Weight: 200g; Package Content: 4 x Clamping Knob