do gears with my bro-inlaw on our backs in the garage, TRYING to crush the pinion nut collar POS with a ****ty 135 psi compressor (didnt even come close). AMAZINGLY my cresent* 1/2 inch drive didnt explode when turning the nutz with 4000 pounds of pressure (my sweet new jack). amazing quality for 75 bucks for a bigass set.