Includes 2 Forged Steel MAX-Torsion KeysIncludes 2?High-Strength Steel Lift BlocksIncludes 4 Heavy-Duty Round Bend U-BoltsSpecifically designed for vehicles equipped with factory lift blocks.Precision Laser Cut for Outstanding Performance and Quality.Proprietary Protective Coating to Prevent Oxidation, Corrosion & Rust.Built-In Taper to Optimize Pinion Angles and Preserve Stock Ride Quality.Increase Ground Clearance & Install Custom Plus Sized Rims & Tires.Simple Instructions for Easy, Do It Yourself Installation.** WILL NOT FIT 2004+ F150 MODELS OR ANY MODELS WITH DUAL PIN BLOCKS. ** THIS KIT IS SPECIFICALLY DESIGNED FOR VEHICLES EQUIPPED WITH FACTORY LIFT BLOCKS, WHICH MUST BE REMOVED BEFORE INSTALLING OUR LIFT BLOCKS. ** REAR LIFT HEIGHT WILL VARY DEPENDING ON FACTORY BLOCK SIZE BEING REPLACED. Developed and rigorously tested by in-house ASE specialists, Supreme Suspensions Lift Kits are engineered to raise the factory rake of your vehicle, enhancing its look and providing a more aggressive profile. Our MAX-Torsion Keys are precision engineered from forged and cold-rolled High-Strength Steel, TWICE the strength of the factory system. These re-indexed keys install quickly and easily by replacing your factory torsion keys mounted in your truck's crossmember, providing your truck with the perfect lift and level.For the rear end, we included our New US Patent Pending Steel Lift Blocks specifically designed for vehicles equipped with pre-installed factory lift blocks. Using Heavy Duty GMAW Seam and Fillet Welding Processes we machined each lift block from 1-Piece CNC Formed Steel Frame and reinforced it's structure with 1/4" Thick CNC Plasma Cut Double Support Walls for maximum strength and stability. These Blocks are fabricated with Built-In Taper to Optimize Pinion Angles and preserve stock ride quality and 9/16th Axle Locator Pins to ensure stability, perfect fitment and easy installation. LAB Tests have shown these blocks can withstand an astonishing load of almost 60,000 lbs with no yielding or deformation observed!These Lift Blocks equipped with 9/16th Axle Locator Pins install simply and easily by replacing the factory blocks installed between your axle and OE leaf pack.Also, our extended U-bolts rise to expectation by being ISO 9001 certified and stamped and exceed current standards in the auto industry. Supreme Suspensions High-Strength Steel U-Bolts are bent & threaded to exact specifications, and finished with an Electrostatic Powder Coating to ensure the maximum level of protection and corrosion resistance. Especially engineered for off-road and heavy duty applications, these U-bolts will restore the clamping force on your spring assembly, maximizing safety and ensuring that you get the most out of your rear lift.NOTES: An alignment is always recommended after altering the height of your vehicle.