1999-2017 Silverado Lift Kit 3" Rear Solid American Steel Lift Blocks FITMENT: 1999 - 2018 Chevrolet Silverado 1500 4WD/2WD CONTENTS: 2 solid American made cast iron rear suspension tapered lift blocks SPECIFICATIONS: 5.7 Inch Length, 2.5 Inch Width, 3 Inch Height TECHNICAL NOTES: Install the tallest ends of the tapered blocks to the rear of the vehicle BENEFITS: American Automotive solid cast iron lift blocks are stronger than aluminum and cast as a single, more stable construction than blocks with pressed pins; They are designed to increase rear load capacity and provide for an ideal tow package upgrade; American blocks absorb noise and vibrations, and are tapered for perfect pinion alignment