3m roloc discs/bristles More on reddit.com

For both discs and stones check and see if there is a industrial distribution business (like Grainger or Fastenal) in your area or welding supply shops, they will have better pricing that box stores and better options. I once saw a "starter pack" of scotch bite discs at a box store (3 grades, 3 sizes, 3 of each of those, so 27 discs total) for $34.99, at the time i was in the industrial distribution game and we sold those same discs for between $.27 and $.35/ea There are three primary types of fastening for discs to pack up pads but roloc has become the standard due to cost of production and ease of use. Just go with it. More on reddit.com

I like a pointy bit that looks like a Christmas tree, a barrel bit somewhat resembles a baseball bat, and an attachment to run 2” sanding discs. More on reddit.com

3m roloc disk assembly, 2 inch. Not the cheap ones in this case you get what you pay for More on reddit.com