- Comprehensive Set: This kit includes a total of 815 pieces of black button head socket cap screws in various sizes: M3, M4, M5, and M6 across 8, 12, 16, and 20 mm lengths. It also contains matching nuts, lock washers, and flat washers, ensuring you have the right components to meet your daily assembly needs. - Durable Material: Made from high-quality 10.9 grade alloy steel, these screws and washers are engineered for strength and durability. They resist deformation, corrosion, and wear, making them ideal for use in harsh environments and ensuring long-lasting performance. - Efficient Design: The button head socket cap screws feature a rounded head with a recessed hexagon, allowing for easy fastening and disassembly without slipping. This design makes them particularly user-friendly when paired with the included hex wrench. - Versatile Applications: Perfect for machine assembly and removable panels, these screws are suitable for a wide range of industries including precision machinery, electronics, household appliances, communication devices, and more. They are ideal for projects involving classified instruments, locks, lamps, lights, and toys. - Key Benefits: - High strength and resistance to wear and corrosion. - Easy to use with hex wrench for quick fastening and disassembly. - Sufficient quantity and variety of sizes to accommodate diverse applications.