S&B Billet Radius Arms are machined out of billet 6061 aluminum for optimal strength and weight. These fit all 4wd 2005-2022 Super Duty Trucks. They also provide better tire clearance (~0.75" more) than factory arms due to their overall thickness. The arms include adjustable caster cam bolts for complete caster control during the alignment process as well as a mounting tab for our 105048 limit strap kit that is required with some shock packages.