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I RARELY use below 1K. like you already said, the only time I use my 400 is when I have to really remove alot of steel to remove a chip or correct some blade geometry. 90% of the time I don't go...

I can't offer too much more than what has already been states, so I will just add my experience.

I have a set of Naniwa SS (400,1k,5k,8k,12k) and they do EVERYTHING that I need them to do.

I...