Tie rods fit snugly into the adapter and are perfectly centered for optimal performance. Popular Size Coverage: Includes 12pcs Crowfoot Adapters with sizes: 1-3/16", 1-1/4", 1-5/16", 1-3/8", 1-7/16", 1-1/2", 29 mm, 32.5 mm, 33.6 mm, 38.4 mm, 40 mm, and 42 mm.