Used to gauge degree of turn when manufacturer calls for fasteners to be tightened further after torque loads are applied. If you have a late model car you may be requiring specific torque and angle measurements. Fits 1/2" Dr. tools and comes with an easy to read dial calibrated in degrees. Specifications: 1/2" male and female square drive. Holding rod to make sure the gauge is in position during use. 360 degrees scale is marked in 2 degree 10 degree and 30 degree increments. Rotating tool housing. Easy to read dial. Calibrated in degrees.