🔩 Extended Carbide Burrs Set - 5pcs JESTUOUS 1/4 Inch Shank Diameter, Long Double Cut Edge Solid Tungsten Carbide Rotary File for Die Grinder Bits Drilling Review

They are designed for a speed of up to 20,000 rpm. They vibrate terribly when spinning freely. In tree and root ball pruners, the head isn't even straight. Very disappointing.

If you are looking for these look no further I use line oil to keep them fresh and they are amazing. It can drill 6 bolts out of a heavy Ford vehicle and cut through hardened bolts and nuts with ease.!

Used to transfer a set of cast iron heads with a pneumatic straight grinder. They showed good results from start to finish. I didn't have the run out issues that some cheap carbide cutters have, so they were better than expected.

Great for my 350 SBC TBI throttle mode. He shaved off that little wall around my throttle body. I loved it but it didn't last long. I was able to use one of the bits once because the sharpness was gone after a few minutes. But I still have four bits ahead of me.

I am a professional auto technician and have paid 3-4 times more for them from tool carts. The same product and quality they sell for a fraction of the price. The length is great for the brake caliper mounts. Unexpected but they come in a nice resealable plastic storage box.

if you use them on soft material they work fine. I think they are smaller than I ever thought they would be. They're not strong, I got what I paid for here, they're cheap, and they're cheap.

These burrs are long enough to get into those hard-to-reach places, but not so long that they can be bent. The collection of head shapes is what you need. They stay on the stone for a long time, that's how I use them. All this and at a very affordable price.