Found this British-made black finish wrench in my overflowing wrench drawer, it stood out from the rest, it's a nice tool. They were made by T. Williams of Birmingham and were apparently supplied in various vehicle tool kits, but the "superslim" name isn't just a trademark, it is indeed quite thin, about 7mm- when a standard 7/8" (across flats) nut is about 1/2" tall. It's a keeper.
Ad from 1962
















