You'll get better results in a home environment with one of these.
Klein 59003 Unibit 1/4" To 3/4" Hole 362-105
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The bit chattered and tried to make polygonal shapes.
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This is a very common problem. I went through it while drilling holes of various sizes in a sheet of steel last year when I made my tube amp.
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Make sure to check out my balls in the Pelican Parts Catalog! 917 inspired shift knobs.
'84 Targa - Arena Red - AX #104
'07 Toyota Camry Hybrid - Yes, I'm that guy...
'01 Toyota Corolla - Urban Camouflage - SOLD
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