
Great little end mills I've used to cut some deep slots in 3/4 inch cold rolled stock have not broken yet. Note, however, that the shaft is 6mm long. So if you need to cut deeper than the length of the groove, you don't need to sharpen the thing a bit. I figured I could turn it a little on a carbide lathe. Very hard tool steel, the carbide barely touched it, I had to grind, haven't tried them on aluminum yet, but they work great on fairly hard steel

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