4 Pcs Carbide Rotary Burr Set, 1/4-Inch Long Shank Tungsten Steel Head Burr Bit Set Fits Rotary Tool for Wood/Metal Drilling Carving Engraving

I used this on a set of cheap knock off Chinese split manifold headers. Worked out ok ,but I knew better to buy set of cheap Chinese headers.

Shipped fast

Great

Be cautious of rpm. These all failed pretty quickly at 25k. I have used a speed controlSince with higher cost burrs with success. The long burrs are pretty picky about wobble and will quickly bend permanently or come apart. They were probably worth the $20 for the four of them, but I can get quality burrs for $20 each that last longer and cut better.

They cut. They are hard to control in a die grinder so I used a drill. Used them on a cylinder head. The heads look like they are brazed on but none came off or bent. They are about the same quality as something stamped Pittsburgh, but worked good for what I needed. I would buy again.

Works great and price was good

The reach would be great if these ran true but unfortunately they are not welded straight which results in uncontrollable vibration and the extreme shock means the carbide chips off and bits become useless. Cutting them down in length may reduce the run out but defeats the purpose.

Great tools, used them on a 5.9l Cummins 24valve, once I finished there is still life in them, probably handle another head or a v8 pair! I recommend these, they did good for me.