Abstract: A socket engageable with a drive assembly is disclosed, the socket having two segments pivotably connected with each having an engageable periphery for rotation of the socket by the drive assembly and together defining a center bore for engaging a work piece, the segments being self locking when the work piece is engaged. The drive assembly has a selectively accessible slot for receiving and holding the socket in the operative position, a mating drive gear for the rotation of the socket and a guide for assuring lateral and rotational stability of the socket.