I had one for a time and it seemed to me to be of a finer grit than 8k. Maybe 12k but I'm not sure.
Piet, cool stone to add to the arsenal. Hope it works well for you someplace in the pecking order.
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At 10.2 x 2.3 cm it could be useful as a slurry stone :)
I am after slurry stone like that:hmmm:. Was this an offer?
I dated a girl from Waraho once . She was pretty soft! :p