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"Grit Rating" does not apply to natural stones. You can say "finishes similar to" or "works like a.."
but you cant give an actual number to it. Even the ever popular Jnats, are rated as...

I cant speak to that kit in particular, but there is Nothing wrong with using an Ark for a razor. a good surgical black, or Translucent white, and you can put a finishint touch on a razor as good...