FandWay 720Pcs Grade 10.9 Alloy Steel M3 M4 M5 M6 Fully Threaded Button Head Hex Socket Screws,Pan Intnal Machine Screws,Bolts,Nuts and Washers Assortment Set with 4 Wrenches(Black)

🔩【High-Strength Material Guarantee】: Forged from Grade 10.9 high-carbon steel with hardness reaching HRC 32-39 and tensile strength ≥1040 MPa. Black oxide coating creates a dense protective layer,Designed for high-load mechanical assemblies, ensuring long-term resistance to deformation and stripped threads.(⚠️⚠️⚠️Attention:Please choose 304 stainless steel for outdoor humid environment） 🔩【Button Head Design】: Sleek Button Head Design with Enhanced Functionality Featuring a smooth, low-profile button head and hex socket design, these screws sit flush after installation to prevent snagging or scratching. The precisely engineered socket depth ensures stable torque transmission, minimizing slippage and stripped threads. 🔩【Multiple Sizes for Versatile Use】: Includes M3 M4 M5 M6 screws with matching 304 stainless steel nuts, flat washers and custom hex keys for turnkey solutions.Eliminating extra purchases.these screws are compatible with precision instruments, electronics, furniture assembly, automotive parts, and more. 🔩【International Standard】:Every screw undergoes strict testing for hardness, thread accuracy, and surface finish. Compliant with ISO 7380 fastener standards, they guarantee precise sizing, secure threading, and reliable performance for professional-grade results. 🔩【Portable & Storage】: Each set comes with a compact storage case to securely hold screws and the hex key, preventing loss and enabling easy portability for efficient on-the-go repairs. Perfect for DIY enthusiasts and professionals seeking reliable fastening solutions across diverse projects.