Originally Posted by silverbear
I don't have air tools, but do have an electric angle grinder, so will look for the rough scotchpad disc for it. Thanks!
It's actually for a 3/8" drill. You'll probably find it in the same area as grinding discs for your angle grinder. They aren't cheap ($6-$8) and do require careful use so you don't ruin them right away. Since they're fibrous, you don't want to use them turning into a sharp edge as it will tear them up. I reverse the drill if I have to in some spots so the pad turns away across the edge rather than into it. Does that make sense? I've used them for years for paint removal.
Here it is. It looks solid in the picture but it isn't.