Liftcraft - Silverado Sierra 1500HD 2500HD 3500HD Leveling Kit | Adjustable 1 to 3 Torsion Lift Keys Shock Extenders and Unloading Tool LIFT: 1-3 inch adjustable front suspension lift over stock FITMENT: 2001 - 2010 Chevrolet Silverado and GMC Sierra 1500HD 2WD + 4WD, 2000 - 2010 Chevrolet Silverado and GMC Sierra 2500HD / 3500HD 2WD + 4WD Models MATERIAL: Made of High Strength Steel, two times the strength of your factory keys INSTALLATION: Bolt-on kit, only takes a couple of hours to install; No modifications required CONTENTS: Carbon Steel Torsion Keys (2), Steel Shock Extensions (2) and Detailed Instructions - Liftcraft suspension lift and leveling kits come with a lifetime guarantee and are the easiest, safest, and most affordable way to improve the look of your truck and run bigger tires