2010-2023 Superduty Billet 1" Lowering Shackle Kit (ICO91001)The ICON 10 23 Ford F Series Billet 1in Lowering Shackle Kit is a clean, precise way to dial in rear ride height on your F 150 without compromising strength or ride quality. Designed for trucks that need a subtle drop to achieve a level stance or fine tune suspension geometry, these billet shackles replace the thin factory units with a stronger, more refined solution. Built to handle aggressive use while maintaining smooth, quiet operation, they offer