1pc. I'm not a metal worker. When I wanted to widen a couple of 1 1/8" and .040" diameter holes in 3" steel, I knew I was going to have a hard time drilling them with the hand drills I have. I'm into these Bumped option.Using some cutting oil and my 1/2" air hammer I drilled out 4 holes in about 10 minutes. The tool worked great and still feels as sharp as new. Worth every penny.
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