The Dura-Grit Carbide 1/4" Square File has coarse & fine grit on opposing faces enables you to remove bulk material, rotate the tool and finish, all with the same tool. The square file is extremely versatile, the 1/4” rod, carbide files, have carbide teeth that cut in all directions. This means they will cut on the forward and back strokes, reducing filing time in half. They are equally at home working on ceramic wall tile as they are on wood. They cut fast and smoothly on composite materials and are extremely useful tools to have in your toolbox.