Heat treated Chrome Molybdenum and Chrome Vanadium steel construction with a smooth black oxide finish for corrosion resistance. Deeply serrated and hardened teeth grip the workpiece from any angle. Curved jaw design applies maximum pressure to all four corners of nut or bolt heads making it ideal for high torque applications. One hand, no-pinch, quick release grip which provides comfort and control, reducing hand fatigue and are much easier to use than traditional style locking pliers. Heavily knurled nickel plated adjustment screw for extra grip with greasy fingers. Supplied in EVA tray.