I needed a small lightweight wrench for my RC field toolbox for a hard to reach nut, so I designed this little wrench. It is about 3 inches long (~80mm) and works on #6-32 nuts. I have included the Inventor file if anyone wants to edit it.

EDIT: The one titled "Regular" works on regular 0.25" flat to flat 6-32 nuts. The other one works on the nuts I had handy which are 0.32" flat to flat.