"I used one of these extensively to remove rust of my workbench which had been stood outside in the rain for 8 years. Needless to say there was more than enough rust to remove.I needed to get the girders and worktop decent enough to paint or treat so that it could be used again. An old friend back in harness."
"I bought this item to skim the brake discs on my car as they had some contamination on them which was causing some wobble with high and low speed braking. I didn't want a rough disc so I went for the 120 grit in case I put a gouge into it and ruined it. I left the disc on the car while it was spinning (engine running, in gear, I know, don't try this at home), and lightly took off the contamination which worked well. Take the disc off and bolt it on backwards to do the other side."