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Of course you mean Naniwa as Norton doesn't make a 12k .... here is where I got my 20mm superstones . From Germany.

As holli4 said you cannot go wrong with either choice. I happen to prefer Naniwas to Shaptons for the overall feel of the honing process. Because I like the feel better I work well with them hence my...

I dropped one on my toe once .,...:roflmao

Just post the item # and we can find it in search.

I like the Naniwa 1,3,5,8 and 12. Just what I have found works well for me. For coarse work I use a DMT 600. Dead link on that ebay thing.