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Re: Drilling Through Hardened Steel
Use a carbide or carbide tipped pilot drill. They can drill a file. Start with about a 5/32. After you get the pilot hole you might try a 3/8 cobalt drill to save money. A metal cutting carbide drill is brittle like glass so be careful exiting the hole. Try to position your body so you can apply most of your weight when drilling but let up before you break through. Good luck.
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