Six-lug, spanner-type wrench to remove and install rear wheel bearing lock nuts. They're 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-spd. axles; 15,000 lb. trailing axles.
Socket O.D. is 2-7/8".
Crosses with: BWP M-1930, OTC 1930, World American WA13-1930