1. – The M3 black hex socket flat head screw set is crafted from alloy steel, known for its strength and corrosion resistance in harsh environments such as temperatures, cold weather, and humidity. It offers rust and oxidation resistance, ensuring a long service life. 2. Safety and ecofriendly – Our M3 black hex socket flat head screws are made from quality, nontoxic materials that are environmentally safe. No harmful substances are released during use. 3. Sharp threads – The screw threads are precisioncut, sharp, and clean, with a compact design that resists deformation and slipping. These bolts comply with standardized metric measurements. 4. Wide application – The M3 black hex socket flat head screw set is for professionals, hobbyists, landlords, craftsmen, technicians, woodworking, construction, plumbing, HVAC, and more. They are also ideal for 3D printing projects and can lost or damaged screws. Suitable for sheet metal and wood, this set is a musthave for both home and workplace use. Multiple sizes are available to meet diverse needs.