Product Description Package Contents: 165 * Zinc Plated Carbon Steel Rivet Nuts 1. High Material - Made of high quality carbon steel and zinc plated, strong and durable 2. Space-Saving Design - Optimal solution for space-saving screw connections. Replace Traditional Weld Nuts 3,165 Different Size Kits - Contains the 165 pieces M3 (0.5mm - 2.0mm), M4 (0.5mm - 2.5mm), M5 (0.5mm - 3.0 mm), M6 (0.5mm-3.5mm), M8 (0.5-4.5mm), it’s good to have multiple sizes. If you need to replace, please choose the size you need 4. Convenient and safe - No need to touch the female thread, no need to weld nut, firm and efficient riveting, and easy to use 5. Widely used - When assembling electromechanical Light industry products and products such as automobiles, aviation, railways, refrigeration equipment, elevators, switches, instruments, furniture and decorations