Vises are used for holding workpieces in place as the user shapes or remodels the designated piece. JET Tools vises are made from ductile iron, steel, and the jaws can be made from a hardened steel. The jaws of the vise can be used to open wider, depending on how big a workpiece is and then is tightened. Vises can be used in a variety of applications from metalworking to woodworking.