• 720-piece assortment including screws, nuts, washers, and hex keys. • Made of high-quality carbon steel with high hardness and corrosion resistance. • Includes screws in M3, M4, M5, and M6 sizes with lengths of 8 mm, 12 mm, 16 mm, and 20 mm. • Hex button head design with clear threads ensuring stable installation. • Ideal for maintenance of office equipment, mechanical machinery, and electronic devices. • Provides a complete solution for replacing damaged or lost bolts with great durability.