, "Mole" grips
) or "Vise-Grips"
are pliers that can be locked into position, using an overcenter
action. One side of the handle includes a bolt that is used to adjust the spacing of the jaws. , the other side of the handle (especially in larger models) often includes a lever to push the two sides of the handles apart to unlock the pliers. "Mole" and "Vise-Grip" are trade names of different brands of locking pliers.
The jaws are set to a size slightly smaller than the diameter of what is to be gripped by turning the bolt in one handle with the jaws closed. When the jaws are opened and the handles squezed together, they move a lever over its center point and lock the jaw of the pliers onto the gripped object. The original "vise grips" were invented in DeWitt, Nebraska in 1924.
Locking pliers are available in many different configurations, such as needle-nose locking pliers, locking wrenches, locking clamps and various shapes to fix metal parts for welding. They also come in many sizes. Leatherman
manufactures a multitool
which includes locking pliers instead of regular pliers, and which folds together to the size of a regular multitool.