Neilsen CT5048 Torque Limiting Extension Bar Set 5 Piece

Use these torque extension bars with an impact wrench to ensure consistently accurate torque for your fasteners
Five 1/2-in extension bars, made of chrome-molybdenum steel, 8-in long, with spring loaded dent ball.
Color coded torque extension bars: 65, 80, 100, 120, 140 ft-lbs (90, 110, 135, 160, 190 Nm)
Material: CR-MO