【Durable for Long-Term Use】- High quality 304 stainless steel provides strength and good corrosion resistance in many environments. 【Sealing Surface】- Have enough contact surface that can be screwed tighter. 【Clear Case for Quick Access】- All screws and nuts are packed in a sturdy plastic box, this set is organized by size/type in a clear storage box for quick access and protection. 【Uses】Widely used in home and office appliances, communication equipment, ship assembly and other machinery industries, furniture, car and motorcycle repairs and DIY inventions! Can also be used for fasteners for storage boxes, industrial and construction fasteners. Ideal for use in tight spaces where the head needs to be flush or below the surface. 【Basic Material Information】- Material: 304 Stainless Steel / Drive Type: Hex Socket / Head Shape: Round Head / Size: other size than M3 M4 M5 (including M3 M4 M5 nuts)