I call them US screwdrivers for they are in the original box with the government stock #. Not sure why the military needed a precision jewelers set, but radio, radar, techs had a need surely. Sure wish the one missing wasnt. Found them at an estate sale. Just under $3, so dont think I was stung too badly. The hex heads are plastic, and turn freely. Dont think I will see another set. Anyone have a set?