SuperBLOK by ProRYDE 3-in-1 design allows rear lift options on your Silverado or Sierra 2500HD and 3500HD of 1.0”, 1.5” or 2.0” designed to put a slight rake back in your leveled truck for hauling or towing, or to work hand-in-hand with your ProRYDE® front lift/leveling kit for a complete 4-corner lift. The blocks are made from cast iron and black powder coated to withstand the most demanding applications with integrated, built-in center pins. Included are OEM grade u-bolts, nuts and washers. View installation instructions</strong