• A variety of nut and bolt set sizes: Includes bolts with corresponding nuts, washers, and gaskets in sizes M3, M4, M5, M6. A total of 680 pieces. • High-quality materials: Made of 304 stainless steel, corrosion-resistant and durable. The bolts and nuts fit perfectly to ensure excellent results. • Precision design: Complies with the standard metric system, the surface is smooth and burr-free, easy to embed and does not loosen easily. • Wide range of applications: Suitable for indoor and outdoor use, ideal for woodworking, construction, automobiles, bicycles, 3D printing projects, etc. • Convenient storage: The pieces are organized in a storage box with stickers for easy identification.