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 asking for 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. Proudly made and machined in the USA. For extreme off road use only.All risks and responsiblities of setting up steering systems are are taken by the installer/purchaser.