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The OP was asking about naniwa Super Stones without the base. That site sells them with the base. The Choseras , also naniwa, seem to be the line you are referring to. Never had a base and far more...

I have the Norton single grit @ 1" thick. The combo stones are about the same but only 1/2" of each grit. I like the single grit stones because you don't need to soak the 8k and if you have the...