T1A 1/2" Drive Torque Angle Gauge for Torque-to-Yield Fasteners, Includes Holding Rod, T1A-E1100 NEED TO WORK ON TORQUE TO YIELD FASTENERS? This is the tool for you! Used to gauge Degree of turn when manufacturer calls for fasteners to be tightened further after the torque loads are applied 1/2" male & female square drive and an adjustable holding rod hold the gauge in position during use 360 degree scale is marked at 2 degree increments & intervals of 10 degree and 30 degree Easily zeroed for next application by turning the tool housing Required when servicing many late model engines that use torque-to-yield fasteners