Shapton Glass Stone Holder, #50200.
This is a very heavy and stable holder, made specifically for the GlassStone series. Note that it is NOT adjustable and so will ONLY work with the Shapton Glass Stones! Yes, it's a bit of an investment, but if you're heavily into using the GlassStones, you'll love this stand, as it's extremely stable and really raises the stones up to a more comfortable level. It weighs almost 2 Kg!
Be sure to check out the Shapton FAQ.
Made in Japan.