There are numerous instances when you may need pliers, and when undoing bolts, you need parallel pliers. The most important feature of these pliers is that their jaws remain parallel irrespective of whether they are open or closed. Parallel pliers are particularly useful when gripping nuts and bolts, given that they do not slip as easily as conventional pliers. While the use of these pliers is not as extensive as most other types of pliers, you can find them in the arsenal of professionals and DIY enthusiasts alike. Jewellers and telecom engineers normally use them as well. The size of these pliers can vary. Some models include grooves for wires. With models that use springs, the handles remain open at rest, unless they include some kind of locking mechanism. They are commonly made of stainless and carbon steel. You can also find variants that use blackened steel and nickel-plated steel in their construction. Get a firm grip on any nut or bolt and undo it with ease.