All the midget stuff you see in that Simonsen military mechanics box is 9/32-inch drive, including a Walden-Worcester flex extension and uni joint, a Williams extension, that knobby stubby spinner, the wingnut socket, and these two Plomb screwdriver bits.
Photos are a little fuzzy (sorry!), but the markings are
v PLVMB v 4844,
SIZE 1, and
3/16 and
v PLVMB v 4845,
SIZE 2, and
9/32. (EDIT: Not to be Captain Obvious, but the 1/4-inch drive pieces would be 47xx series numbers.) Finish is black oxide.
The wingnut socket is cadmium finish and unmarked but looks identical to a few JO Mfg wingnut sockets I have, although I now find the detent hole interesting.