The one I bought was only 4 or 4-1/2 inches because I have a 4-1/2" grinder. You may be able to find something even better for a 7" polisher. If I had a 7" polisher, I'd probably go with the 8 inch flexible disc mentioned elsewhere in this thread. I've only been able to find it at the autobody supply store.
The guy there told me he stripped and entire BMW down in about an hour with that setup.
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Greg Reid
Palmetto, Georgia
 
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