2x Rear HD STEEL LIFT BLOCKS4x Premium Electrostatic Powder Coated U-BoltsInstallation instructionsWe are proud to introduce you Supreme's New 2019 Lightweight Steel Blocks for Rear Lifts. Developed and rigorously tested by in-house engineers, our blocks are precision machined from ONE Piece of Steel! Using heavy-duty GMAW seam and fillet welding processes we've made this block superior than those other blocks that are welded on all 4 sides. Our Heavy Duty Steel rear blocks are constructed with one reinforced center pin and a 1/4" Thick CNC plasma cut center support structure to ensure stability, perfect fitment and easy installation. Also, these Blocks are fabricated with Built-In Tapper to optimize pinion angles and preserve stock ride quality. NOTES: An alignment is always recommended after altering the height of your vehicle.