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The lapping stones by Naniwa and Norton are hones like any other - they do not necessarily come flat out of the box, and they need periodic lappings. It's the diamond on steel plates, like DMT's,...

I have gone through the 1 3 8 12 progression, and it certainly can put an edge on a razor. But I bought the 5 and 8 (without the 3) because that's what I prefer. My razors will cut arm hairs above...