I clicked on the link and took a peek at the offer. The box has P-310 on it and when I googled that it shows that it is a 1K bevel setter. It also shows sp12000 on the side that may show that the stone is a 12K. I don't have the Naniwa 12 so I cannot compare the two. I'm confused. Does anyone here have the 12K Naniwa to compare with the offer? Buyer beware and double check withe the seller before buying.