5 Pc 1/2" Drive Torque Limiting Extension Bars, 65, 80,100, 120, 140 ft lb limits.  Use as an extension bar between your ratchet and sockets with preset torque limit break points, in other words when your torque hits the rated limit, the extension bar clicks letting you know you've hit that torque.  Great for lug nuts, head bolts and other car nuts and bolts where a common preset torque is needed.  Comes in a handy blow molded storage case.