Features and Benefits: Self-energizing lower jaw provides 3X more gripping power than traditional locking pliers, with no-slipping or stripping; Provides maximum torque without requiring heavy input pressure - jaw mechanism naturally grips tighter as more torque is applied to the tool; Classic trigger release provides maximum locking force; Curved jaw puts tremendous pressure on four points of any style nut or bolt head, making it perfect for any application that requires maximum torque; Constructed of high-grade heat-treated alloy steel for maximum toughness and durability; Hardened teeth are designed to grip from any angle. Hex key adjusting screw tightens to adjust pressure and draw materials together and provides a controlled release. Backed my the Irwin Vise-Grip Lifetime Guarantee. Jaw capacity: 1-1/8".