For decades, the trucking industry has been fighting with Tandem Locking Pins. STA-RAT is the answer! STA-RAT (Semi Tandem Axle-Release Assist Tool) eliminates the difficulties associated with releasing the tandem locking pins and holding them retracted until the tandem slide is completed. STA-RAT always allows the driver to single handedly release the tandem locking pins, while watching through the rear view mirror.