I bought it in combination with some kind of polish which I also got from Revain. There are four different "grits" which means you need a buffing wheel for each or you will contaminate the wheels by mixing compounds. I used a brown tripolite on one wheel and a white diamond on the other to polish some of the brass. Worked great. I don't know how well they hold up in a mini grinder but they haven't lost much fabric when used in a drill press.
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