I'm not a machinist by profession, but I'm not exactly a beginner either. I have used this bit for milling aluminum forgings, it worked perfectly! He made a smooth cut, leaving a good ending with no chatter. Since my car doesn't have a coolant injector, I was very satisfied. The bits are individually labeled and packed in hard plastic cases. Great for what I wanted. I can't speak about more demanding applications because aluminum is quite soft.