sourcing map2pcs Solid Carbide Drill Bits 3mm C3/K10 Tungsten Carbide Precision Mini Micro Straight Shank Twist Drill Bit for Stainless Steel Metal Plastic Wood

Work well

The best thing about these is Amazon's returns policy.In fairness, they arrived very quickly, which was great because I had a job on stop waiting for them. They came in a small box labelled with "Made in China" . Inside, the two bits were ominously kept in a cheap poly sleeve.Granted, they felt good in hand and felt sharp. They also cut well. My issue is that they both snapped and in the exact same place.Now I know that Carbide, while incredibly hard is also incredibly brittle. So I was very careful to use them correctly.I'm a mechanical engineer of 26 years. In my opinion, these are poorly quality bits. My advice would be to spend a little more and purchase bits of a better quality. I used amazon on this occasion because time was a factor. The application I needed these for was tough... But should have been well within the capabities of decent carbide drill bits.