Doesn't make clean cuts. I bought similar drill bits from a local store that work much better. I don't know what the problem is, maybe the tilt angle? Anyway, too expensive to send back. Keep it for rough work.
I bought them as a last resort to drill some blanks for the handles and two blanks in my project, the first one was blunt. Needless to say, they lasted less than 5 minutes. Remember the old adage, try it, you get what you pay for.
These are very cheap drill bits so I honestly bought them. I had to drill 2 x 10mm holes about 3/8" and knew I would never need them again. I had to pre-drill the holes with a good 3/8 inch drill bit I had and enlarge the holes a bit with that drill bit, so I didn't ask much of them, but they barely managed to pull off this simple task. Their material is probably decent quality for HSS drill bits, but they were poorly sharpened and dull at the cutting points. If you just need to drill a fewβ¦