Chainnose pliers can be used for all sorts of things, including breaking off beadwork, as demonstrated here.
Jewelry jump rings
Jump rings are circles of wire that are used to connect one object to another. You may purchase jump rings or you may create your own.
Opening and closing jump rings
To open a jump ring, grasp each side of its opening with a pair of pliers. Don't pull apart. Instead, twist in opposite directions so that you can open and close without distorting the shape.
Related free articles:
Make Your Own Jump Rings using a jeweler's saw
How to Make Your Own Jump Rings using wire cutters