This 521- piece flange bolts assortment kit is a must - have for your projects. It comes in 16 different sizes, including M6, M8, and M10, with various lengths, providing you with a wide range of options. The metric flanged hex bolts (DIN6921 ) have both partially and fully threaded designs, suitable for different load types. The flange head and nuts, along with the serrated flange, offer a stable and firm connection. Made of grade 8.8 alloy steel, it is corrosion - resistant, acid/alkali - resistant, and has high hardness. Whether you're working on home repairs, DIY projects, or industrial applications, this kit will be your reliable assistant. The triple - protected packaging ensures that the bolts, nuts, and washers arrive in perfect condition, ready to serve you for a long time.