What is tongue in groove pliers?

Tongue and groove pliers, also known as channel locks or water pump pliers, are a type of adjustable pliers commonly used for gripping and turning bolts and nuts, as well as for holding and bending wire and sheet metal. They have a curved jaw with two interlocking teeth that can be adjusted to different widths by sliding along a track or "tongue". The tongue and groove design provides a strong grip that can be adjusted to fit various sizes and shapes, making them a versatile tool for both professional and DIY applications. Some models feature additional features like wire cutters, pipe grips, or slip-resistant handles for added functionality and comfort.