Metric Rivet Nut Mandrel Kit Threaded Insert Rivnut Assortment Set, 60 PCS/Box M3-M8, 70 PCS/Box M4-M10, 53 PCS/Box M3-M8, 77 PCS/Box M3-M12

1. Covers standard metric sizes from M3 to M12(Optional Specifications), complete with matching mandrels and rivet nuts. Meets various project needs for automotive repair, sheet metal fabrication, and home workshops without the need to purchase additional accessories.
2. The rivet nut mandrels are forged from high-hardness carbon steel, offering wear resistance and pressure resistance; the included rivet nuts are made of zinc-plated carbon steel for rust resistance, ensuring rugged durability and a long service life.
3. Precision internal thread design effortlessly fits standard hand rivet tools and drill adapters, threading smoothly and fastening securely to effectively prevent jamming and thread stripping.
4. Housed in a sturdy partitioned transparent storage box for convenient access, keeping your workbench neat and organized.
5. Suitable for sheet metal fastening, pipe connections, auto body modifications, mechanical equipment maintenance, and various DIY projects, making it a practical tool set for repair technicians and DIY enthusiasts.