Belltech 3921 Torsion Bar Key Set Belltech's unique and industry first "broached" torsion bar keys are a direct OEM replacement and allow you the simplicity of lowering your torsion bar equipped Sport Truck or SUV approximately 1 to 3 inches All Belltech Torsion Bar Keys are cast from high strength ductile iron All come powder coated for a lasting finish Specifically made for your vehicle with guaranteed fitment OEM ride quality with added performance, control and comfort Fits 1999 - 2004 Chevy/GMC, 4-wheel drive, 1/2-ton light duty trucks Will lower a 4x4 by repositioning the torsion bar Adjustable so you can dial in a 1" to 3" drop Torsion key adjustments retain the use of the 4-wheel utility