Mesee 4Pcs Tungsten Carbide Rotary Burr Set, 6-Inch Long Rotating Burr Tools Kit with 6mm Shank for DIY Woodworking/Metal Carving/Polishing Engraving/Drilling

Works just like it should. Other reviewers must have had the shaft not installed all the way down and using the wrong air pressure. Obviously incorrect settings will damage anything. After three hour of use the shafts are still straight as an arrow. Burrs didn’t get all gunked up or dull but i was also using it on aluminum.

Porting head. Remember to use light pressure and finesse not force. Keep tools clean and cool with cutting oil.

Very sharp but don't bind there so long bend easy at high rpm

Good quality tool, fast shipping

Grind very well didn’t bend it gets the job done !

turned my die grinder on and it bent into l shape almost got away from me wobbling so bad never even got to see how they cut. I put another one in and same thing very dangerous cheap product they are on their way back to amazon cheap garbage

Used one tip one time and the shaft bent. I touched it to the surface of my metal and didn't get to try cutting because the shaft bent so bad I was afraid the bit would ruin my project and tool. Picture is of the bent shaft next to one of the others that came in the set. I rechecked the ad description and did not see any mentions of tool limitations. I would not recommend using these tips with a high RPM tool.

One bent in 5 seconds. Another one had the head blown off. Then i tried one more and it bent. I have one left and i dont want to use it anymore.

Not 6mm, so will slide off, about 50microns short of 6mm, not worth the hassle. Yes these are cheap and in the end you get what you pay for.