【Standardized Metric Sizes】The M3-0.5 hex socket head cap screws set comes with 8 commonly used lengths—M3×8mm, M3×10mm, M3×12mm, M3×16mm, M3×18mm, M3×20mm, M3×30mm, and M3×45mm—ideal for routine installations and repairs. They meet standard metric specifications, with an average error of less than 0.01mm. 【Premium 12.9 Grade Alloy Steel】This M3 bolt, nut, and washer assortment kit is crafted from high-strength 12.9-grade alloy steel, ensuring exceptional durability and load-bearing capacity. The high-strength steel resists wear, corrosion, and heavy loads, making it ideal for harsh environments. 【Wide Applications】Our metric bolt and nut sets come in boxes with thick, fixed dividers. Both internal and external labels mark the corresponding screw sizes and quantities for easy storage and access. The sleek box is convenient to carry in your daily tool bag, and also makes a great gift for professionals and hobbyists who regularly repair furniture, cars, and more. 【Easy to Use】This M3 screw kit is ideal for daily furniture assembly and mechanical repairs. When using it, simply pick up the screws with tweezers, insert them into the hardware that needs to be connected, then tighten them with the included M3 wrench. Finally, install the nuts and flat washers to prevent loosening. Disassembly is just as easy—simply unscrew in the opposite direction. 【Smart Storage Box】The metric machine screw kit comes in a durable, compartmentalized case with clear size labels—so you can spot the right screw instantly. It keeps your workspace tidy and speeds up project progress, making every job smoother. Transform your DIY builds and 3D printer repairs with this comprehensive M3 screw assortment kit, featuring 940 high-quality components for endless versatility. Crafted from ultra-durable 12.9 alloy steel and finished with sleek black zinc plating, these M3 screws, M3 bolts, and accessories resist corrosion, wear, and stripping—ensuring long-lasting performance in any project. Complete Set Includes: M3 socket head screws (hex socket head design) in 8 sizes: M3x8, M3x10, M3x12, M3x16, M3x18, M3x20, M3x30, and M3x40 mm. Matching M3 nuts and bolts, plus washers for secure fastening. Organized in a compact M3 bolt screw sorter tray—no more hunting for parts! Why Choose Our M3 Screw Kit? ✅ Perfect for 3D Printers: Essential 3D printer screws for assembling frames, extruders, and enclosures. ✅ All-in-One Convenience: This M3 screw set replaces scattered supplies with a single M3 screws kit—ideal for robotics, electronics, furniture, and more. ✅ Premium Build: Hex socket head screws (including M3x8 SHCS and 3x8mm hex screw) offer superior torque resistance. The M3 black finish adds a professional look. ✅ Wide Compatibility: As 3mm screws and M3 machine screws, they fit metric-based projects flawlessly.