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Gotgrit.com has all the Silicone Carbide grits you will need, from 60 up to 500 grit, a ¼ lb of each is plenty, you just need a table spoon or two of each grit. Finish on Wet & Dry. Will cost you...

The bottom line is they are a crap-shoot. Some can polish, some can’t, they are natural and all are different, some from one side to the other. They are hard stones and will need to be lapped flat...