Review on HARDELL Rivet Nut Tool, 12-Inch Hand Rivet Nut Setter Kit with 60Pcs Rivet Nuts and 6 Metric & Inch Mandrels (M5, M6, M8, 10-24, 1/4-20, 5/16-18) in a Sturdy Carrying Case by Tim Pulse

I had 2 problems. With the M5, when tested, either the thread crossed slightly or it snapped off the stainless steel I had. The included yellow prongs worked well. This problem became even more serious when I tried to remove the nut. The knurled grip on the trigger kept slipping. A very small Allen screw is used for fixation. After searching a bit I found that 5/64 was best and only one of them suited me. 2mm slipped and not tightened well. Even as hard as I could get it, I had some slippage. Fortunately, no more paint was removed from the thread. So I'll end up using a double nut to prevent this from happening in the future. A double nut is used to hold the mandrel in front. It's not clear why they didn't do this from behind. Well proven both on corrosion protection and on the M6 provided in the test. The initial problem with the M5 may be due to a slight change in threading on one side or the other.