6.7mm Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bit of 1pcs with Straight Shank to Cut Through Hard Metals Such as Stainless Steel and Cast Iron, 5% Cobalt M35 Grade HSS-CO

These are amazing for their price range. I've extracted multiple steel bolts with them and they're very strong and sharp. Excellent bits.

Perfect size, for m10 tap size. These are nice and straight cut well in cast iron.

Great & hard-to-find tooling at a great price. Secure check-out, well packaged and as described, with prompt shipping. Will use again.

They look nicely made , very clean polish and very sharp tips. Yet to test if they can cut or not, so lets update soon. One thing is very bad is the toy box they come in, not even worth the container. They scatter in the bag they come in. Luckily else they'd be in another state.

Worked excellent, very sharp. I was able to drill out a hole on my turbo, which is very hard these drill. Bits do a great job. Very impressed.

Just as described above

I just received 10 pcs drill bits (3mm) and when I ordered I was quite skeptical regarding the quality... 10pcs for less than $8. Come on, don't worry, it's probably another piece of junk that I fell for because of the price. Let me tell you something: I just tested it and it worked like a charm! I just love it 😊 I highly recommend this product and the seller! Two thumbs up 👍👍!!!

The one I used drilled a perfect hole in the wood I needed a hole in.