These are both heavy duty wrenches, the shaft is 7/8" in diameter and other than a 3/4" difference in length are the same. Each has a formed 1" hex socket at one end and a 1"hex plug at the other end. One is 10 3/4" long and the other 11 1/2". The plug can be put into the socket of the other to make a longer wrench. They were given to me by a member of our car club. Any idea who made them and what they were used on.