They were easy to use. I used them to remove scratches on an old piece of plexiglass that I scratched with a razor scraper when peeling off the 30 year old paper. I started with 1000 grit, then 1500, 2500 and finally 3000. I used a plate on each side of the plexiglass. Worked well when I used them on wet sand. I would buy again.
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