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Amazon.com: 13 PCS Metric M35 Cobalt Steel Twist Drill Bit Set HSS Extremely Heat Resistant with Straight Shank to Cut Through Hard Metals Like A Hot Knife Through Butter,Such as Stainless Steel,Titanium
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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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