Metal crimpers crimp, fold, seam, or flatten sheet metal, deforming metal to hold itself or become a needed shape for an application. Hand seamers make crisp, accurate angle bends in sheet metal, creating a finished edge, or bending/flattening metal to a desired shape. Sheet metal crimpers create indentations on ductwork, which allows ductwork to fit together snugly. They also include crimpers that are specifically designed for particular applications, such as downspout crimpers, which create gutter connections, and metal stud crimpers. Sheet metal folding tools, such as drip edge folding tools and edge rollers, make clean, uniform bends in lengths of sheet metal.