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PHIG = C12K (PHIG is short for People's Hone of Indeterminate Grit, which describes the stone better as it is impossible to assign a grit rating to a natural stone)
DMT 325 = DMT Coarse
They carry...

To just keep your razor shave ready, your 4k/8k and a C12k will be plenty adequate (you don't need slurry on the C12k). You could use diamond spray or CrOx after the C12k, but it certainly isn't...

Hi Roy,

You can drop the nagura stone from your list. Think of slurries as advanced honing techniques. After you learn without slurry, then experiment with it.
For flattening you can use the...