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Found this thread on the Spyderco forums about Ceramc grits.
There;s differeing opinions on the grits.

Interesting, I used to work in a tool store that sold the DMT diamond and Spyderco Ceramic (hence, I have a couple for my wood working tools- wish I bought the extra fine:mad:). According to Spyderco...

Hmm, interesting... any consensious on what the Spyderco Fine ceramic is? I wonder is that could be a Norton 8K equivalent....