Review on Dremel Mounted Abrasive Grinding Wheels by Craig Lovro

They work well in my Craftsman Dremel. The metal rod that fits into the chuck appears to be a slightly smaller diameter than other Dremel brand bits. I tried switching to the sanding drum after loosening the chuck just enough to remove 1 of these and had to do a few extra turns to install it. Not really a problem, just something to consider. I was hoping the spherical bit would be a bit larger. The diameter is only about 12 mm. This is the only spherical bit I've seen that fits a Dremel rotary tool so I'm very happy with it.