Best Dremel bit for grinding metal?

I was able to remove a bearing race using the red oxide cutting disks. I just went through a whole mess of them. It was the carrier bearing in the flywheel of my old car. What a mess.

@majorrich use the fiber reinforced wheels, those red ones are worthless and unsafe IMO. These will make short work of anything, even stainless.

I find those wheels to be a little dangerous and quite limited. I may use one as a cutoff tool for thin round-stock, but that’s the extent of my trust for them.

Personally, I’m a fan of carbide burr bits for any fine work on steel. I’ve used them to get through Inconel and Titanium and they do fine. However, you have to be careful not to let them chatter or you risk snapping the edges off. Also, “gummy” metals (aluminum!) clog them fast.

Don’t get the diamond burr bits; those work more by abrasion than by actual cutting, and while that works well on ceramic, it gums up fast on most metals.