Heavy Metal Suspensions - 2011-2018 GMC Sierra 2500HD (4WD) and 2011-2018 GMC Sierra 3500HD (4WD) Adjustable 1" to 3" Front Torsion Keys + Shock Extenders High Strength Carbon Steel Lift Kit DETAILS: Adjustable 1 to 3 Inch Front Lift APPLICATIONS: 2011 - 2018 GMC Sierra 2500HD (4WD) and 2011 - 2018 GMC Sierra 3500HD (4WD) PACKAGE CONTENTS: (x2) Carbon Steel Adjustable Torsion Keys, (x2) Carbon Steel Shock Extenders, Hardware and Installation Instructions TIME FRAME: Installs In Approximately 2 - 3 Hours. Torsion Tool is Required Heavy Metal Suspensions products are the safest way to lift your vehicle without compromising ride quality. CNC constructed with computer programmed pulse welds, Heavy Metal high-grade steel is guaranteed never to break under even the toughest conditions. Each kit comes complete with hardware,installation instructions and ASE certified telephone support.