Fullers, in particular, are swages that have a cylindrical or beveled face, typically three to six inches long, which are used for imprinting grooves into the steel. If a groove is to be applied to both sides of the steel, two fullers may be used at the same time, sandwiching the workpiece in the middle. Often, one fuller will have a peg that holds it securely in the anvil, while the other fuller will have a handle and a flat head, for striking with a hammer. Sometimes the two fullers may be connected with a flatbar of spring steel which is bent into a wide, "C" shaped bracket, keeping the two fullers aligned with each other and freeing the smith's hands for manipulating the workpiece and hammer. A blade being fullered will generally be slowly pulled through the fullers as they are being hammered, until the entire groove is the proper depth and shape. As the fullers make the groove, they typically displace material to the side, creating ridges around the grooves. These ridges may be hammered flat, widening the blade, or they are often shaped with other swages, increasing the strength of the blade by creating thicker areas in its cross section.