• Made of durable carbon steel with a galvanized finish for high hardness and resistance to corrosion, rust, and oxidation. • The set includes 80 pieces in M6 and M8 sizes with a flat head design to facilitate insertion into various workpieces. • Internal thread knurling design and vertical strips on the surface ensure a reliable, secure, and non-slip fixation. • Suitable for a wide range of materials, including metal, steel, aluminum, iron, plastic, and fiberglass. • Ideal for applications in automobiles, aviation, railways, elevators, instruments, furniture, and indoor or outdoor DIY projects. • Easy to install using riveting tools in pre-drilled holes.