Premium material: The star-shaped handle is made of copper plastic, and the surface is well polished, with good toughness and impact resistance. M8 star knobs: Hexagonal star shape, smooth surface without burrs, won't hurt your palm while providing support. The internal thread is clear and the force is uniform. Easy to useScrew-on design, easy installation, disassembly and adjustment. Just line up the internal thread on the screw and turn it tight. The surface is smooth and comfortable to hold. Widely Used: The star handle is very suitable for manual adjustment in mechanical engineering and is widely used in the wind, air and fuel industry. aerospace, office equipment industry, etc. Quantity: We have 10 threaded knobs to meet your needs and they are the perfect replacement for old or broken knob handles.