2x Front Billet Lift Spacers2x Rear Steel Lift Blocks4x Premium Electrostatic Powder Coated U-BoltsInstallation instructions? Will NOT fit Tundra Rock Warrior and TRD PRO models? Rear Kit is NOT compatible with models equipped with TRD Suspension Package.Supreme 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.Our blocks are precision machined from High Strength Forged Steel! 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 a 1/4" Thick CNC Plasma Cut Center Support Structure and a 9/16" Pin to ensure great stability, perfect fitment and easy installation.We've also made sure the extended U-bolts we provide rise to expectation, being ISO 9001 certified and stamped. NOTES: An alignment is always recommended after altering the height of your vehicle.