Supreme Suspensions - Silverado 1500 Lift Kit + Nitro-Charged Performance Shocks Adjustable 1" to 3" Front MAX Torsion Keys + 3" Solid Aircraft Billet Rear Lift Blocks + MAX Torsion Bar Tool + Shims FITMENT: 1999 - 2007 Chevy Silverado 1500 (4WD). CONTENTS: 2x Cold-Forged MAX Torsion Carbon Steel Lift Keys, 2x Solid Aircraft Billet Lift Blocks, 4x Extended Zinc Plated U Bolts, 4x Nitro-Charged Performance Shocks, 1x MAX Torsion Bar Tool, 2x Axle Pinion Alignment Shims, Installation Hardware, Installation Instructions, and Pro Pack. TECHNICAL NOTES: Adjustable 1 to 3 Inch Front Leveling Lift and 3 Inch Rear Lift. Compatible with 2007 "Classic" models only. INSTALLATION: Easy 'bolt-on' installation takes 3 to 4 hours. Torsion bar unloading tool is included. BENEFITS: Improves the look of your truck and increases ground clearance, allowing you to fit larger custom rims and tires. Nitrogen-charged shocks provide an enhanced ride quality and off-road capability.