OTC's Six-Lug Tubular Spanner-Type Wrench removes and installs rear wheel bearing locknuts on heavy-duty axles. Rugged tool is designed for use with a 3/4 inch square-drive ratchet or breaker bar. Tool is NOT intended for use with impact tools - use with impact tools will void the socket's warranty. For use when servicing Chevrolet and GMC 11,000 to 13,500 lb. axles. Socket has a 2-7/8 inch O.D. Limited lifetime warranty.