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Drilling through steel : r/knifemaking
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
How to Drill Steel: 15 Steps (with Pictures) - wikiHow
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How to Drill through Metal: 10 Tips and Techniques
Finding The Best Drill Bits For Hardened Steel | RUKO Shop UK
Versatile 10 Piece Cobalt Drill Bit Set for Drilling Through Hardened Steel | eBay
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How to Drill Steel: 15 Steps (with Pictures) - wikiHow
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