This wrench design will be 125 years old next month.  Robert McCormick designed it, and the simplicity of his design has a lot going for it. The large hex adjusting nut can be used by cold fingers. The wrench is compact enough, 8 or so inches long, to fit in your pocket. It's shaped so it won't fall out of a pocket, and it breaks apart easily for cleaning.

Nice!! You come across some of the most interesting wrenches...