Crane Hi Clearance Chromoly Steel HSC (Hi Strength Casting) knuckles are built to handle anything you can dish up. They are beefed gusseted and thickened at critical points for the ultimate in strength. The Knuckles and caps carry a lifetime warranty against breakage. The Hi steer arms are 1" thick cold roll steel machined to a precise fit, are not corrected, but can be by adding a 7/8 OD 5/8 ID x 2" long sleeves that need to be installer machined/welded into the arms.  This keeps all possible strength. These products are designed for extreme off road abuse.