Made To Fit 2005-2019 Ford Super Duty F250, F350, F450 and F550 4WD trucks. If you are lifting your Super Duty truck or already have lift kit installed on your Ford Super Duty truck and want to improve the ride, tracking and overall strength, reliability and performance of your truck then what you need are a pair of ReadyLIFT Heavy Duty Radius Arms. These extremely tough Super Duty radius arms are constructed of thick steel formed with a tabbed and slotted design for maximum strength. A tough powdercoated finish ensures the radius arms will look great for a very long time. Whether you are into off-roading your truck or just daily driving or towing, upgrading to our heavy duty radius arms will properly align and position the front axle of your lifted truck. This ensures the tracking can be set right as well having the piece of mind that your radius arms will never fail under any off-roading situations. Allows you to add caster for a better alignment on lifted or leveled trucks. Features Urethane bushings that will last longer and can be greased by a zerk fitting.