Mars-Rock Carbide Burr Set 1/4" Shank 10PCS w/Wood Base Die Grinder Bits Rotary Rasp File for Metal Welds Concrete Stone Wood Plastic Carving Cutting Chamfering Grinding Engraving Porting Trimming

I haven't used them yet, but almost ready to with upcoming project, will update.

These rock. ...... I needed to enlarge 4 holes in hardened steel. I think I did damage some edges on the larger cylindrical bit but I got the job done and it was only 30 bucks for a set of 10. I just wish I had a bigger compressor and a maybe a better die grinder.

Despite what the pictire suggests these are good working burrs on welds, steel etc. Purchase an aluminum specific kit to prevent sticking. I have used these for many projects and have been impressed by the sharpness retention. They still eat away at whatever you point at like they were new many work hours later and for a fraction of premium kits. Temper your expectations for a $20 and expect the occasional bit to snap. Decent. Would buy again.

I don't use these terribly often but when I need them nothing else will do they will hog out metal faster than a file or a die grinder any day. Considering how expensive these carbide bits can be on the market this is a very affordable option that will work great for you so happy I bought this

This is good bit set. They didn't fit my air tool perfectly, but I think that was an issue with the tool, not the bits. I've used them quite a bit and they've stayed sharp.