My universal cast opens and closes to fit perfectly to one’s arm, leg, or anywhere else it is needed. To use the cast, you simply open it, place your arm or leg inside it, and contract it until tight. Once it is tight enough, you screw all the hinges into place so it stays tight and will not come undone. It is very easy to use and works on people of all sizes. It can be reused over and over again and will not wear out very easily.