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In case anyone doesn't know this(I certainly didn't), drill bits for glass work pretty well drilling through hardened steel. More info in comments. : r/Blacksmith
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Blacksmiths Drill Bit MASO 15 mm Blacksmith Reduced Shank HSS Drill Bit for Aluminium, Steel, Wood, Plastic, Non-ferrous ect : Everything Else - Amazon.com
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HSS Cobalt Blacksmith Drill Bit Reduced Shank Drills Metric Sizes 12mm – 35mm – ASA College: Florida
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