Curved Jaw , Specially designed to grip circular objects. Ideal for plumbing and general pipe work., Rolled chrome vanadium steel bodies, 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, fitted with wire spring to ensure efficient opening of the jaws. The locking mechanism holds the wrench in place once adjusted, leaving both hands free.