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    question

    what bit would you use to drill a 3/8 hole into a 1/4 inch thick piece of hardened steel?
    - jerry F

    answer

    If is hardened steel, then the only way to drill it is with Carbide Tipped Die Drill.
    it is not cheap, but it will do the job.
    - John
    See All of John's Q&A
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