A speed wrench and complimentary hand grip is provided. The wrench includes a casing which mounts a standard drive mechanism which has a drive member axially projecting from the casing in order to engage a work piece. The wrench has an added feature in the form of a drive head rigidly attached to the...http://www.google.fr/patents/US4791837?utm_source=gb-gplus-shareBrevet US4791837 - Speed wrench and hand grip combination
