Review on Amlits 205PCS 304 Stainless Steel Rivet Nut Assortment Kit - Threaded Insert Nutserts Set with Flat Head for M3-M10 Sizes by Dale Sundet

I had to research these rivet nuts before I bought them. In most cases, a special tool is required to install them, but you can actually do a do-it-yourself crimping technique with things you have on hand (see These rivet nuts are made of stainless steel, so they're a bit more difficult to crimp) . than aluminum, but they are also stronger and more weather resistant. This is a good collection of different (metric) sizes with enough items of each size.