The ICON Vehicle Dynamics 1 Cast Block Kit is a simple solution to tune the rear ride height of your vehicle. These heavy - duty lift blocks provide 1 of rear lift on vehicles that do not come with factory rear blocks, such as the 2016 - 2023 Nissan Titan XD. They are also conveniently paired with the 2008 - 2024 Ford F - 250F - 350 2 Lift leaf Spring Expansion Packs to maintain near stock ride height with a significant ride quality improvement and reduction in axle wrap compared to the OE leaf springblock combination. These cast iron lift blocks include center pins for an easy install and are painted semi - gloss black for corrosion resistance.