This 5 piece vise-grip locking plier set comes with self-energizing lower jaw which provides three times more gripping power than traditional locking pliers, with no slipping or stripping. It provides maximum torque without requiring heavy input pressure as jaw mechanism naturally grips tighter with more torque applied to the tool. One-handed with trigger-less release, this locking plier set is twice easier to open than traditional locking pliers. Also comes with anti-pinch and non-slip grips that provide comfort, control and less hand fatigue. Its 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 with high grade heat-treated alloy steel for maximum toughness and durability!