Locking pliers are pliers that can be locked into position to provide a stronger and more stable grip on the item they are applied to. Locking pliers are also known as either vise grips or mole grips and include a bolt, knob, or screw, which is used to adjust the spacing of the jaws and therefore the pressure that is applied to the object the pliers are gripping. Locking pliers are ideal for loosening cross threaded screws, bolts and joints that are stuck, and nails that are in spaces that are too small for tools such as claw hammers. They are also useful for working in small spaces such as car engines and reducing the strength and effort you need to apply to complete a job.