Socket driving head for a box end wrench

A socket driving head for a box end wrench comprising:

• a) a main body having a polygonal member with a shape corresponding to that of a closed loop of the box end wrench, a semi-closed pin hole for movably receiving a plurality of engagement balls being provided at one side of a lower end of the polygonal member and communicating with a longitudinal hole of the main body, the main body further having a polygonal neck with a ball hole;
• and
• b) a quick-release bolt received in the longitudinal hole of the main body by use of a spring, the quick-release bolt having two arched recesses for receiving the engagement balls and an engaging steel ball, respectively,
• whereby a shaft of the quick-release bolt forces the engagement balls and the engaging steel ball to protrude outwardly, and, in removing the socket driving head from the socket or the wrench socket, the operator needs to press down the projecting quick-release bolt in such a manner that the engagement balls and the engaging steel ball fully fit into the arched recesses to allow an easy and quick detachment of the socket driving head from the socket.