Torque extension bars are widely used in both DIY and professional garages to quickly tighten lug nuts and other fasteners to pre-set torque designations. The 5pc Torque Extension Set provides torque values that are applicable to many of today's car, truck, and trailer lug nut torque requirements. The 1/2" drive bars are designed to be used with pneumatic or cordless impact wrenches. Each bar is color coded to help you quickly identify the torque value and stored within a convenient plastic storage case.