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I know they go to 30k, I've just never seen or heard about a shapton 20 or 25k. I've heard of the 16 and then the 30. Have they begun producing a 20 and 25k stone?

I read a lot about guys finishing razors on glass plates. Are we talking about shapton glass plates or something different? I believe I recall one gentleman referring to a 20k glass plate and it got...