The 6¼″ opening easily holds the torsion bar in place when loosening or tightening the nut. This torsion bar unloading tool is fully compatible with your hand wrenches. WIDE COMPATIBILITY: This torsion key tool easily removes or holds the torsion bar in place on a wide variety of vehicles, compatible with a range of models from Chevy, GMC, Dodge, Cadillac, and more (see all compatible models below).