Combination Pliers usually have serrated jaws, which provide friction when gripping, and square tips, although there are some variations in jaw design. Combination pliers often have a rounded, serrated cut-out in the jaws, called a pipe grip, for holding rounded materialsApplications include the straightening or twisting of wires.The firm grip provided by pliers means you can pull objects, usually to remove them from something. Pliers are often used to extract things like staples or thin nails