2x Front Billet Lift Spacers2x Rear Steel Lift Blocks4x Premium Electrostatic Powder Coated U-Bolts2x Energy Suspension Upper Control Arm Bump StopsInstallation InstructionsPrecision CNC Machined for Outstanding Performance and QualityProprietary Protective Coating to Prevent Oxidation, Corrosion & RustIncrease Ground Clearance & Install Custom Plus Sized Rims & TiresSupreme Suspensions PRO-Billet Strut Spacers are precision CNC machined from T6 Aircraft Aluminum, then anodized black for a superior corrosion resistant finish. The SOLID single-piece construction ensures extreme compression resistance, while still being light-weight and resistant to typical corrosion associated with off-roading.For the rear of your vehicle, we are proud to introduce the New 2019 Low Weight HD Structure Steel Blocks. Using Heavy-Duty GMAW seam and fillet welding processes we reinforced it's structure with a 1/4" Thick CNC Plasma Cut Center Support Structure and a 9/16th Center Pin 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!We've also made sure the extended U-bolts we provide rise to expectation, being ISO 9001 certified and stamped. NOTES:*PRO4x model will NOT fit 3" or 3.5" front spacer.*Rear kit will work only for models with Spring Over Axle Suspension Setup.*Factory 1/2" u-bolts are being replaced with upgraded 9/16" u-bolts which requires enlarging retainer plate holes.An alignment is always recommended after altering the height of your vehicle.