This item is a beryllium copper wrench made by Berylco. Its purpose is to be used safely in a hazardous environment. No sparking. It is 11 inches long 2 inches wide and 1/2 an inch thick. The ratchet is 1/2 inch square. The ratchet works. It reverses direction simply by turning the wrench over. Turns to the left on one side and turns to the right on the other side. There is an etch on one side, see photo, that a previous owner put on probably for identification which is faint and hard to read. I can make out what looks like AGC and then some zero's. On the one side is, "10 BERYLCO" , on the other side is, " BE CU W 960 ".