【Durable for long term use】- High quality 304 stainless steel provides strength and good corrosion resistance in many environments. 【Support surface under Constraint】 - Have enough constrained bearing surface which can be screwed tighter. 【Transparent case for quick access】 - All screws and nuts will be packed in sturdy plastic box , this set is organized by size/type in a clear storage case for quick access and protection. 【Usage】- Widely used in household and office appliances, communication equipment, electronics, etc. assembly of ships and other machinery industries, furniture, car and motorcycle repair and DIY inventions!Can also be used for storage box Fastening component, industrial and construction fasteners.Ideal for a use in con areas where the head should be flush or below the surface. 【Material Basic Info】- Material: 304 Stainless Steel / Drive Type: Hex Socket / Head Style: Button Head / Size: Size different from M3 M4 M5 (Include M3 M4 M5 nuts)