there are also square "1/8"npt pipe plug" sockets out there that are 1/4" drive and a 5/16" square female indention to be used on 1/8"npt pipe plugs with a 5/16" male square top.
i have a couple that are snap-on, and one that is a no name brand.
i have marked the one socket with a white line, so i can tell where the band adjuster is when bottomed, then count the number of turns needed for adjustment.