Features and Benefits: Six lug, spanner-type wrench removes and installs rear wheel bearing locknuts; Built for use with a 3/4" square-drive ratchet or breaker bar; Wrench for servicing Chevrolet and GMC 15,000 lb. axles; 17,000 lb. 2 speed axles; 15,000 lb. trailing axles; Socket O.D. is 3-5/8";