• Made with high-quality 304 stainless steel, offering high strength, durability, and heat resistance. • Includes a wide range of sizes: M3 x 8/12/16/20 mm, M4 x 8/12/16/20 mm, M5 x 8/12/16/20 mm, M6 x 8/12/16/20 mm. • Complete set with corresponding nuts and washers for each size: M3, M4, M5, M6. • Organized in a storage box for easy access and organization. • Resistant to rust, high temperatures, and corrosion, ideal for engineering, electronics, chemistry, water construction, and furniture.