A socket tool includes a handle and a socket is movably mounted to one of two ends of the handle. A groove and a plurality of notches are defined in the outer periphery of the end of the handle. The socket has two passages defined through a wall of the socket and an angel is defined between each one...http://www.google.fr/patents/US6951154?utm_source=gb-gplus-shareBrevet US6951154 - Ratchet socket tool
