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XXC Extra Extra Course
XC Extra Course
C Course
F Fine
EF Extra Fine
EEF Extra Extra Fine

The real stats are on their homepage.

D general shorthand for Diasharps, afaik.

First thing I did with them was putting a khukri to them. It had nicks from putting it blade on blade with a sword, I am sure that would have broke them all in.

You bit of diamond breaking off is...

If you work the surface even with a bit smaller of a known flat surface like a DMT, the current flat area will hold it flat. All bets are off if you just rub along one edge though lol. you can also...