OSIDU Carbide Burr Set-5pcs 6X8MM Head Carbide Rotary Burrs File Set with 1/4 Inch Shank for Die Grinder Drill Bits Metal Carving Bit Polishing Drilling

Ate through aluminum, mild steel, high carbon steel, very impressed. You can tell they're legit because I dropped one and it made that distinctive high pitched "ting" that tungsten has, when it hit the floor. I would say they're almost TOO aggressive; on smooth flat surfaces, they'll chatter if you barely touch the surface, but will also dig in real hard if u push down with them. Other than that, I'm super impressed at all the shapes, nothing has broken off yet, but if they do, I'll update this. Very happy thus far.

I needed newer bits to help grind out larger openings in my knife tangs for pins. These did the trick perfectly for 8mm pins! Great quality and a good value IMO. I'll return to this brand if/when I need various sizes in the future.

I am very happy with the performance of these bits. I used them to remove grout. The result was outstanding!

They work very well and long lasting. I've abused them alot and still work like new. I will definitely be buying more in the future

Looking for a tool to grind hardened metal. This is the tool you need. I will order these again.

Inexpensive but handy little kit

Great product Great price

The bits worked as advertised.