We bought these to change some holes in 1/2" sheet steel. I had to change 24 holes so I bought 3 nozzles to have a spare. or two just in case one wears out. A drill did all the modifications. It was never necessary to use the other two bits. So I'm happy with the quality and durability. We have used them in drill bits and milling tools (low speed) which I would buy again.
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