grip wrench bodies are manufactured from rolled chrome vanadium steel and have drop forged hardened steel jaws with corrosion resistant bright nickel coating. The jaw opening and clamping pressure can be adjusted with the knurled head screw and is fitted with a wire spring to open the jaws automatically. The locking mechanism holds the wrench in place once adjusted, leaving both hands free and is easily disengaged by squeezing the release lever. Long rounded jaws with smooth section. For pinching off hoses without serration and gripping small sections of pipes. Invaluable aid for brake repairs on cars.