Irwin Vise-Grip 10" Curved Jaw Locking Pliers feature a curved jaw that grips and torques multiple surface shapes, including round pipes, square or hex bolts and more. The pliers have a 3 times more gripping power than traditional pliers. The self-engineering lower jaw pivot allows the jaw to align on the workpiece for maximum grip without slipping or stripping. The pliers provide maximum torque or grip without requiring heavy input pressure. The jaw mechanism grips tighter as more torque is applied to the tool. The pliers are built strong with high grade alloy steel that is heat treated for maximum toughness and durability. The hex key adjusting screw tightens to draw material closer together for a tighter grip and loosens to provide controlled release. The guarded release provides easy jaw opening.