Not sure that 'c' and 'd' are really the same. The rotary saws that I
have seen (including the Ryobi one I have) seem to be much coarser,
much more apropriate for cutting, and built more like a router than
the Dremel that I have that seems to be a much finer and multi-purpose
tool. I have never seen someone use a rotary saw for polishing and
conversely I have never seen a real tradesperson use a dremel to cut
drywall (not that it couldn't...)
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