illustration of drilling pilot hole
Illustration: Harry Bates
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Drilling a Pilot Hole: Step 1

1. With twist bits, I keep tabs on hole depth by wrapping the bit with a piece of blue painter's tape right at the depth I want. If you're drilling down, leave a little "flag" of tape sticking out from the bit. It will sweep away the shavings around the bit just as it reaches the desired depth.
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