[High Quality Carbon Steel Material] These bolts are made of carbon steel, sturdy and durable for long time use. 100% brand new and high quality. [Zinc Surface-Plating]The surface of the wood screw is zinc plated for better performance, zinc finish for better corrosion resistance, the surface is zinc plating and not easy to oxidize. [Indispensable accessories for maintenance]Can be used with bolts, studs or machine screws for fixing two parts [Applications]Widely used to fix and support glass advertising boards, store signs, mirrors, display shelves, etc. *40mm. Please confirm this is the product you need before ordering [Size Information] The size of this pin screw (thread diameter * total length) is M20 * 60 * 30 (mm). Please confirm this is the product you need before ordering