OTC 1931 Tubular Spanner Wrench for Chevrolet and GMC Six-lug spanner-type wrenches remove and install rear wheel bearing locknuts They're built for use with a 3/4 inch square-drive ratchet or breaker bar Socket O.D. is 3-5/8 inch Designed for servicing Chevrolet and GMC 15,000 lb axles 17,000 lb 2-spd axles and 15,000 lb trailing axles Limited Lifetime Warranty