This is a box wrench, Wright Tool 9389, in 12-point, chrome finish. Wright hot-forges its wrenches and drive tools from alloy steel at its own Ohio plant rather than buying forgings in, and the broaching is cut to hold on the flats of the fastener rather than the corners.
Full contact on all faces of the fastener, which is what you want on a bolt that has been torqued down and left to corrode. This one is SAE.
Wright Tool has hot-forged hand tools in Barberton, Ohio since 1927, and publishes a per-SKU disclosure for the small share of its line that is not US-made.








