Review on 431 CNMG 331 TNMG WNMG by Edwin Cen

These are great for stainless steel, tool steel, 4140 and a few other things I've tried. I also use insert holders from the same manufacturer and they are very beneficial. From what I've heard the blades don't last as long as some of the industrial inserts, but thanks to their reasonable price I'm not worried about them breaking if I make silly beginner mistakes.