I had to drill through very hard steel for a knife handle I made. I tried a black oxide bat and broke it. Then a titanium coated bit that literally melted because it got so hot and I used oil. And finally a cobalt drill that almost broke through but unfortunately the tip of the drill stuck in the steel and managed to weld into the steel I was trying to drill out. I got what I ordered and I honestly didn't think it would work. But to my great surprise, it pierced through cobalt and all. At least I was shocked. This is an absolutely awesome exercise and I would recommend it to my friends. Thanks very much!
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