1.【Durable and long-term use】 : High quality 304 stainless steel offers good corrosion resistance in many environments. ^2【Powerful surface】: There is enough force-bearing surface to be tightened. Lid is convenient for quick access】 All screws and nuts are packed in a sturdy plastic box. The set is arranged in a clear storage box by size/type for quick access and protection and DIY inventions and can also be used for storage box fasteners, industrial and construction fasteners. Ideal for tight areas where the head needs to be flush or below the surface.^ 5.【Basic information material】: The material is 304 stainless steel, the drive type is hexagon socket, the head type is button head, and the size is different from M3 M4 M5 (including M3 M4 M5 nuts).^