I built this about 10 years ago - I call it my Prep-Station.
As you can see it's just a bunch of scrap welded together mounted to a truck tire with a mandrel on top.
The motor was scrapped out of a washing machine, garage door opener or something ???
One end has a wire wheel the other a flap sander.
The wire wheel is great for rust or paint removal.
The flap wheel is good for cleaning up areas to be welded, grinding light chamfers and polishing out saw marks.