Water pump pliers are a kind of hand tool used for grasping and rotating items. They are sometimes referred to as adjustable pliers or groove-joint pliers. Their adjustable serrated jaws can be used to bite through nuts, bolts, and odd-shaped objects of different sizes. Adjustments can be made without extending the distance between the handles thanks to the lower jaw's slid able tracking part beneath the upper jaw. This makes them very helpful for gripping objects with huge diameters, such as pipes, whether they are square, hexagonal, or spherical in shape.