Velo Solo Track Tool (15mm wrench).
I got black:
They are available in lots of fruity colors:
It's really well-made with tight tolerances. Fits the track nuts snugly. It's made of aluminum. I trust that it'll hold up over time. I guess we'll see. I like the fact that it's completely flat on both sides, and not angled like most wrenches. Arrived in Atlanta in about 2 weeks.
It doesn't do anything that my 15mm Craftsman didn't do. I just thought it was cool. It is maybe 1 inch or more shorter than the Craftsman. So far, I'm very happy with the bling purchase