Review on 🔩 200-Piece Assortment Kit of flat head threaded Rivet Nuts - Nicunom 304 Stainless Steel Metric Rivetnut Insert Nutsert Rivet Nut in M3 M4 M5 M6 M8 M10 Sizes by Alton Walton

The plastic case is cheap, but I expected that. The nuts appear to be of good quality. Haven't used them much so can't comment on durability, but with a good wrench they aren't difficult to install. Mounted the kit to my car's frame to install support rods for my car's splitter. Much simpler than the previous setup and uses a lot less hardware. Very satisfied and would buy more from the seller. Slightly harder than zinc, but if funds do not allow the use of a special tool, it can be installed with a homemade tool.