Hello, I have 2 stones one lighter and finer grit,other one darker gray and slightly courser. They are both Carborundum stones, (at least they were in the black carborundum boxes). I am trying to find out the info on these stones.
The lighter one is 4 3/4 inches long 2 inches wide and 1/4 in thick
The one is same dimensions except thickness is 3/8 in thick.

Thank You,

John Owens
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