LuKaiSen 781PCS M3 Hex Socket Head Cap Screws and Nuts Assortment Kit, Grade 12.9 Alloy Steel Metric Bolts (M3 x 6/8/10/12/16/20/25/30mm) with Flat Washers & Wrench,Black Zinc Plated for 3D Printing

1. ULTIMATE GRADE 12.9 HIGH TENSILE STRENGTH: Crafted from premium 12.9 grade alloy steel, these M3 bolts offer superior tensile strength and durability compared to standard stainless steel. The professional black zinc plating provides enhanced rust resistance and a sleek, uniform finish, making them ideal for high-stress mechanical and industrial applications. 2. COMPLETE 781PCS ALL-IN-ONE SOLUTION: This massive hardware kit covers all your fastening needs. It includes 260 screws in 8 popular lengths (6mm to 30mm), 260 matching hex nuts, and 260 flat washers. We’ve even added a dedicated Allen wrench, so you have everything required for installation right out of the box. 3. PRECISION CUT & STRIP-RESISTANT DRIVE: Featuring a deep, standardized internal hex socket drive, our screws ensure a perfect fit with the included wrench to prevent stripping. The clean, sharp threads and tight tolerances are engineered for high-precision tasks like 3D printing assembly and robotic projects. 4. VERSATILE M3 METRIC ASSORTMENT: Designed for hobbyists and professionals alike. This kit is the perfect companion for FPV drone building, RC car maintenance, PC water cooling loops, and household repairs. The wide range of lengths (up to 30mm) ensures you’re never caught without the right fastener for deep-hole mounting. 5. SECURE STORAGE & INSTANT IDENTIFICATION: All 781 components are neatly organized in a rugged, transparent partitioned case with secure latches. Each compartment is clearly labeled with size and quantity information on the lid, allowing you to find what you need in seconds and keep your workbench clutter-free.