Review on 🔧 STARTO 14" Rivet Nut Tool: Complete Kit with Interchangeable Mandrels and Carry Case - 21 Piece Set for Efficient Rivet Installations by Dee Parson

So I mainly bought M6 and M8 rivet nuts to get rid of the self tapping screws in my converted car. I've used m6 maybe 5 times and the threads are stripped which prevents the stainless steel rivet nut from being crimped properly. I've used M8 with great success, but it's too big for many uses like small brackets. I need a replacement M6 mandrel but can't find it anywhere online for this product. I am extremely disappointed. If you want to use M8 or larger rivet nuts then I expect this will work really well for a great price. He asked me to rate the cleanliness? It has no definition or meaning.