All Traxda torsion keys are CNC laser cut from Mill Certified (A+) steel. The tensile strength level of steel is twice as strong as it needs to be. The ends of the keys are precision drilled to allow for both the adjusting bolt and the installation tool. All keys are powder-coated with an "environmentally green-friendly" black finish. The kit comes with shock spacers and is designed to use the stock GM shocks or stock length aftermarket replacements...no need to search for longer shocks! Front wheel travel is increased up to 2.25" and stock ground clearance is greatly improved. This leveling kit fits the Chevy Silverado and GMC Sierra 2500HD and 3500HD models..