2001-2010 GM HD / GM 1500 Torsion Bar Keys (110-90269)Torsion bar keys are used to set the ride height of the front of the truck and are commonly used in leveling kits, and it is important to set the height appropriately as to leave ample suspension droop travel to maintain a good ride quality. Features Torsion Bar Keys for 01 10 Silverado Sierra 2500 3500 2WD 4WD Torsion bar keys are used to set the ride height of the front of the truck and are commonly used in leveling kits Forged Steel Finish: Raw