In this video, Nancy LT Hamilton shows you how to achieve flat, square edges on sheet metal using either sandpaper, files, the guillotine shear, the Wolf Belt Sander or the miter-cutting vise/jig. Included in the video are specific instruction on how to use the miter-cutting vise (available here: http://www.riogrande.com/Search/miter-cutting-vise-jig), as well as instruction on the use of the triangle and the drafting compass. Nancy will also show you how a block of wood and a couple of files can help you obtain 90° angles.