Grinding And Sharpening: In metalworking, sandpaper may be used for grinding and sharpening many steel equipment and surfaces. Coarser grits, like 36 or 60, are used to remove material and condition the steel. This is especially useful for reshaping or sharpening blades, chisels, or other cutting applications. More Good Grits https://www.pinterest.com/pin/1001488035878380855/