2000-piece metric screw assortment kit that includes M2, M3, M4, and M5 machine screws along with lock and flat washers, nuts, and bolts. Here?s a breakdown of the key points: Product Specifications: Screw Sizes: Includes M2, M3, M4, and M5 screws. Thread Pitch: M2 ? 0.4mm M3 ? 0.5mm M4 ? 0.7mm M5 ? 0.8mm Thread Diameters: M2 ? 2mm M3 ? 3mm M4 ? 4mm M5 ? 5mm Thread Lengths: M2 ? 4mm, 8mm, 12mm, 16mm M3 ? 6mm, 8mm, 12mm, 16mm M4 ? 8mm, 12mm, 16mm, 20mm M5 ? 8mm, 12mm, 16mm, 20mm Accuracy: Standardized metric system with an average error of less than 0.01mm. Material Quality: Grade 10.9 Alloy Steel ? High-strength material ensuring durability and precise threads. Black Finish ? Likely coated for corrosion resistance and improved longevity. Storage Convenience: Comes in a sturdy plastic storage box for easy organization and accessibility. Contains a variety of commonly used sizes for different projects. Applications: Suitable for general repairs, industrial use, machinery, electronics, and home projects. Useful for both professional and DIY applications.