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Yes. The Amazon one is the SuperStone which is the older version of what is now called the Specialty.

Now buy the SRD version to avoid sending money to the evil corporate overlord.

The specialty (former superstone) is softer and loads up faster and so needs to be refreshed more often. While it works just fine, I would say it is the least aggressive of the three.

The...

Actually, that is not the case. While you don't want to do edge repair work on a SuperStone (specialty) 12k, it really does not take that long just to set a bevel. I have never bothered fully doing...

It actually works much better than a Swaty for bevel setting!

I've seen references to "a nagura" and "the nagura" but I still don't know WHAT nagura.

What is it?