Home > Jobber Drill Bits > 13 PCS Cobalt Drill Bit Set M35 HSS Twist Drill Bits 1/16"-1/4" for Hardened Metal, Stainless Steel, Cast Iron, Plastic and Wood ; Visit the HIDOTOL Store
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I tried 6 different sizes of drill bits but only 1 worked as expected. The other 5 drill bits broke off, changed color or did not make any progress while drilling.
I had difficulty drilling holes in a stainless steel step tube using carbon steel bits, but the Cobalt drill bits were able to drill right through it. I personally found them to be accurate for my purpose.
I'm not sure what was going on with the 7/64th bit and later I broke the tip off another bit, so the hardness is really there.
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