A socket wrench is very similar in nature to its more common box-ended wrench sibling except that it appears more like a cup that fits over the nut or bolt instead of the box ended wrench which slips around the perimeter of the nut or bolt. As with wrench sets, the socket wrench is also available in both metric and SAE Society of Automotive Engineers sizes. It also shares the plating process in common with the more common wrenches.sockets