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They work a treat - I've just got two of them (one for the DMT and one for the other hones) from Amazon@ around US$14 ea+ shipping.
They are made by Steelex, I think.
All I have to do now is hone...

Glen has three 'one stone honing' videos IIRC and I'm not sure in which one he explains the use of two hones (it could be the Thuringian) - in essence the 1k (king, chosera, norton, whatever) is the...

That Norton looks like a carborundum stone to me and they need to be used with oil.
IME they would be far too course (even the fine side) to use on a razor.
Unless the edge is damaged (ie. chips...