S&B 2023+ Super Duty Billet Radius Arms are machined out of billet 6061 aluminum for optimal strength and weight. They also provide better tire clearance than factory arms due to an angled design and the overall thickness. The arms include adjustable caster cam bolts for complete caster control during the alignment process as well as a tab for our 105048 limit strap kit that is required with some shock packages. Our Beam Arms utilize OEM radius arm bushings to retain factory feel and vibration isolation.