●SIPTENK METRIC RIVET NUTS: M3 x 120pcs, M4 x 100pcs, M5 x 80pcs, M6 x 60pcs, M8 x 40pcs, M10 x 20pcs, M12 x 5pcs, 425pcs & 7 different sizes in total. ●HIGH-STRENGTH CARBON STEEL ZINC PLATED: The rivnuts nutserts, made of carbon steel plated with color zinc, are not easy to damage and fade, anti-oxidation and anti-corrosion, no deformation, and can be used for a long time. ●EASY TO USE: Rivet nuts are compatible with most rivet nut tools on the market. The applicable steps are simple and clear, convenient and stable, so you can use it without worry. ●FLAT HEAD & WELL-DESIGNED GROOVES: The flat head and carefully designed groove can increase the stress area and friction, making the rivnuts more firm after installation without falling off. ●PRECISE & CLEAN THREADS: The nut rivet tool kit, with fine manufacturing process for smooth surface and clear threads without burrs, ensures users have a good purchase experience. ●PLASTIC STORAGE CONTAINER: Includes a durable but lightweight plastic storage container, which can protect the nutsert tool kit from rusting and keeps all the rivnuts stored intact. ●WIDE ALLPICATION: Due to its high strength, the threaded rivets are suitable for a variety of heavy materials, including metal plate, steel, aluminum, plastic, glass fiber, etc. The rivet nuts an excellent choice for decoration, vehicle modification, other electrical repair and industrial product. ●AFTER-SALES GUARANTEE: If you have any questions about Siptenk rivet nut kit, please feel free to contact us. We will do our best to help you solve the problem and ensure to provide you with a pleasant shopping experience.