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I would agree with the 1/16 on the 4K side maybe more and the same on the 8K side these days, maybe less. Doesn't take too long thought with the DMT 325 to get to smooth on both sides and usable.
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The Norton 4K/8K is continues to be a very good stone so long as you lap both sides past the grainy stuff to where both sides become smooth. I still go through 2 of these stones a year, so they get a...