The IRWIN Vise-Grip 10R Fast Release™ Straight Jaw Locking Pliers have heavy-duty jaws that allow for maximum contact on all work shapes, including round pipes, squares, or hex bolts. They have a self-energising lower jaw that allows for three times more gripping power and last twice as long, as the high grade alloy steel is heat treated for maximum durability. ProTouch™ grips provide more control, comfort and less hand fatigue. A Hex key adjusting screw tightens to draw materials closer together and also provides controlled release.