MaterialThreaded hand knob is made of high quality plastic with smooth surface and durable. The surface of the screw is made of galvanized material, wear resistance, corrosion resistance, high temperature resistance, rust resistance and long service life. Star Shape DesignStar shaped clamping screw adopts star shape design, simple and fashionable. Comfortable to hold, easy to tighten screws by hand, no slippage, no burr. Easy to useKnurled screws are comfortable to hold and are fully threaded for easy installation, removal and adjustment. Easily secure your mechanical projects by simply pulling or releasing by hand. Star Hand Grip ScrewsStar Grip Screws have smooth button heads and are perfect for holding. Not only beautiful, but practical. The star-shaped handle and grip can really give you a more comfortable grip. Wide Range of ApplicationsM6 Knurled Screw surface is carefully polished for a comfortable grip. Widely used in machine tools, mechanical equipment, instrumentation, food and industrial equipment, etc. Features of Knurled Screws: Our star hand grip screws m6 x 40 are smooth and perfect for fastening. Not only beautiful, but practical. It is very convenient to replace broken or missing nuts with plum shaped knurled screws. Easy installation without tools. You just need to turn directly by hand to install or remove. M6 star grip screws are widely used in lathes, machinery equipment, instrumentation and industrial equipment. 12pcs M6 star shaped set screws . Enough for your daily use and replacement. Specifications: Product Name: M6 Butterfly Screw Material: Plastic, Galvanized Iron Color: Black Quantity: 12pcs Type: M6 x 40mm Thread Diameter: M6 Screw Length: 40mm Package Includes: 12 * Threaded Hand Knob