SA-5 Tungsten Carbide Burr Rotary File Cylindrical Shape Double Cut for Die Grinder Drill Bits 1/4'' Inch Diameter of Shank and 1/2'' Inch Diameter of Cutter 1'' Inch Cutter Length

Works as it should. I bought a larger one a while back. Just needed a smaller version.

I needed to move 12 holes down 1/8” in 3/8” thick stainless steel exhaust headers. I purchased extra cutters guessing I would wear some cutters out. The first cutter is still sharp after completing the job. I’m guessing 5 minutes each hole using a battery operated 20v drill on low speed. I’m very impressed with the quality. Highly recommended.

I’ve only used this on wood, and it works great on that. Not sure how well it holds up to steel or aluminum.

Does what it should, so far I've used it on stainless steel, and it works great, with no noticeable damage.

Used it to make a faucet hole in a cast iron sink. Worked like a charm. Bought a $5 one at Lowes and it wouldn't touch. This one cut through the cast iron like it was butter.

As described

This produce is heavy. Was looking for a Dremel bit. This came up with the Dremel bit and said tungsten instead of carbide like the other bit. As I occasionally grind metal, I ordered the tungsten bit without looking that this one has a shank for a drill. Stupid me. Will probably return because I'm having a hard time thinking of when I would use this, though if I had to mow my own lawn it might be good for a lawnmower blade or grinding off sharp ends of a chain link fence. Maybe doing repairs on seriously damaged knives that are beyond the help of a knife sharpener. Even then, I think I would want the small Dremel bit of they made it in tungsten.

Works great