• Complete set of 800 M4 pieces including flat head hex socket screws, nuts, washers, and spring washers • Made of high-quality stainless steel, corrosion-resistant, sturdy, and durable • Screws with clear threads and uniform pitch, easy to install with a hex key • Hex nuts that improve precision and tightening effect • Washers and spring washers that increase contact area, reduce stress, and protect parts and screws • Includes the following screw sizes: M4 x 6 mm, 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 30 mm, 35 mm • 200 M4 nuts, 200 M4 spring washers, 200 M4 washers • All components are organized in a transparent storage box with compartments and labels for easy use and installation • Ideal for applications in household appliances, offices, boat assembly, furniture manufacturing, car and motorcycle repair, DIY projects, industrial and construction fasteners