Review on 🔩 High-Performance TEMO Cobalt Spiral Flute 22 2mm Drill Bit for Precision Drilling by Pete Hahn

I bought these after reading a lot about how step drills work. Turns out most cheap ones won't drill through stainless steel. The basic principle is obvious: in order to drill through any material, the drill must be made of a harder material. For this reason, diamonds are often used for cutting. It's the hardest material there is. For step drills (and other metal drills), cobalt is the best material. However, the cheap ones don't last long as they either don't contain cobalt or are only coated with a thin layer of cobalt. So be careful with tricky ads. I found this TEMO which had great reviews and after reading about it turned out to be made entirely of cobalt. And it wasn't as expensive as other brands. I was skeptical because I had read that you would have to spend $50 or more to get cobalt. This baby cost about $20 and I have to say it ran like butter through my 18 gauge stainless steel kitchen sink. Here's how we made it: Other materials/tools needed: Starrett 117C rock drill bit. Cutting Oil: CRC 03400 16 oz Truetap cutting fluid. Use punch and hammer. Rub until a small hole appears on the sink. Don't be afraid to hit hard. Be careful with your hands :) The bar is needed to lock the bat in place. 2- Mark the step you want to achieve with a permanent marker. It becomes easier to see where you are. Pour 2-3 drops of cutting oil (I used CRC 03400 Truetap Cutting Fluid Heavy) into the kerf. Also apply 1-2 drops to the tip of the step drill. Have the bit brushed with extra oil. You can smear it with your finger. 3- Drill at the lowest level. WITHOUT IMPACT. Start slow. 4- You will see the bat start chewing on the metal. When the bat starts smoking, STOP. If you see too much metal debris, STOP. Clean the bat, clean the area. Dip the bat in water to cool it down (doesn't damage the bat at all). Dry the denture and apply oil again. Reapply the oil to the clean area. Cleaning the area is necessary to avoid unnecessary friction and heat. Does the job better. 5- Next. You can increase the speed once the beat is stable. Keep an eye on the smoke and cool the racket if necessary. 6- Once the tip of the bit is all the way through the metal it becomes very easy. Don't use too much force. It's better to go slowly than to drill too big a hole. You can't go back to that. 7- Have fun! The bit made a very clean hole, no grinding needed. The chisel also showed no signs of wear. The well drilling time was about 5 minutes.