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they come in 3" and 4" diameters..... flat or cupped...usually at your hardware/auto/lumber stores... use an electric drill and some gloves and a face shield with safety glasses and alot of time........ you might want to clean an area then wipe it down with laquer thinner then paint it as you go......just an idea....... use the coarse wire also......it'll take about 2 minutes to get the hang of it..
Wire wheels on a drill may work on removing paint, but as far as removing rust, it's only going to work on the very most surface types of rust ...and even then not a great job in my experience. If it doesn't cut through your rust, you can also try sandpaper on an angle grinder (the type that has many pieces arranged in a circle overlapping each other). The ultimate best way to remove rust (although messy) is blasting, using sand or other media (glass, plastic, etc).
The underneath and frame of my 68 was coated with varying thickness of grease/sand. For the frame I used an electric drill with a rotary wire brush. After the wire brush traatment the frame was pretty much bare metal, and I washed it off several times with lacquer thinner soaked paper towels. Next I sprayed it with Eastwoods chassis black.
Eastwoods sells an alternate to the wire brush, it's made by 3M. It's called the Bristle Brush. Look in Eastwood's catalog for part 31128 (Green 50 grit), 13198 for yellow 80 grit and 13199 for white 120 grit. The brushes are to be used with a drill or rotary polisher. They're 4 1/2 inches in diameter and cost about $25.00.
Yes, for rust...unless it's just superficial rust, you're probably looking at the need for a sand blaster/acid dip, etc process.