M35 Cobalt Drill Bit Set 20PCS(1/16"-1/2") High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal with Index Storage Case

they drilled well, that's what they should do...

Excellent quality bits at a good price.

I used these for drilling out a large bolt. They worked well, though one of the bits broke (I think due to over heating). Would buy again.

Great drill bits!

I got these to drill holes through thin stainless steel. They worked really well. They have two straight sides on the bottom so they don't spin in my drill. Very tough, went right through without a problem. They come out fairly easy but the car holds them good too. The price was right. I had to cut through the metal slowly but surely.

Drilled the holes I needed like a hot knife through butter. Thanks!

These don’t look like any cobalt steel drill bits I’ve bought elsewhere. They look an awful lot like titanium coated bits, which are better than uncoated but last a tenth as long when drilling metal as real cobalt. If they were real cobalt, there would be no need to coat with titanium.

I don't know about mine I let them before I got to use them and never got them back I think the borrower likes them