Liftcraft - 1997-2007 (Classic) Sierra Lift Kit 1500 4WD Adjustable 1 to 3 Inch Front Torsion Bar Lift Leveling Keys | GMC Leveling Kit (2PC Black) LIFT: 1-3 inch adjustable front suspension lift over stock FITMENT: 1997 - 2007 GMC Sierra 6-lug 1500 4WD 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) 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