SI FANG 3 Pack 3" x 5/8"-11 Assorted Nylon Filament Abrasive Wire Cup Brushes Set, 80 120 240 Grit Nylon Bristle Cup Wheel, for Metal Furniture Surface Prepping&Polishing, Removal Rust Paint, 12500RPM

Used this on my angle grinder to remove the char from old bourbon barrel staves. Worked a treat. I ended up using the red one.

I haven't used these yet, but you should be aware that they don't come with an arbor so you will need something like this to use them - https://www.amazon.com/dp/B07SDB32RH/ref=cfb_at_prodpg

I bought this to clean-up a bath tub I am about to refinish.Within a minute the bristles were falling out and the cup completely flat.I can see that happening after a few hours of use but not in a minute.Expensive for the short use time of a disposable grinder brush

I wish I could return this junk. Total waste of money.Does not remove even light rust from painted surfaces.Bristles melt into the paint you are trying to remove, even at low speeds.So you end up with gray melted plastic on the paint.Bristles have deformed and it's no longer cup shaped, more like a disc.