Material Threaded hand knob is made of high quality plastic with smooth and durable surface. The surface of the screw is made of galvanized material, wear resistance, corrosion resistance, high temperature resistance, rust resistance and long service life. Star-shaped design Screw clamp star-shaped adopts star-shaped design, simple and fashionable. Comfortable in the hand, easy to hand-tighten screws, no slipping, no burrs.Easy to Use Thumb screws are comfortable to hold and are fully threaded for easy installation, removal and adjustment. Easily protect your mechanical projects by simply pulling or releasing by hand. Star Hand Clamp Screws Star Grip Screws have smooth button heads and are great for holding. Not only beautiful, but practical. The handle and the star-shaped grip can really give you a more comfortable grip. Wide range of applications M6 knurled screw surface is carefully polished for a comfortable grip. Widely used in machine tools, mechanical equipment, instrumentation, food and industrial equipment, etc. Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.