GMC Not Specified K-D Tools #2464 Rear Axle Spanner Socket made in USA, exactly same as Snap-on Blue Point #ANS 1929, probably by the same manufacturing'r just stamped differently. 6 lug, 2-5/8" O.D. and 3/4" square drive. For Chevrolet & GMC trucks 1946 thru 1983 with 5,000 & 7,000lb axles only. Tool is new, never pre-owned, shows some shelf wear, weighs 2lbs.