I buy pretty much the same ones. They work great for rust and paint removal,
Ideally with a variable speed grinder or failing that, a battery grinder that spins a lot slower than corded.
Funny you should post these as I almost bought them the other day. In the end I bought an £18 6 disc set that has 3 different grades of coarseness. Arrive tomorrow.
Had a look for some good deals on Amazon as it's Prime Day but really wasn't anything to get excited about.