Task Tools 80 grit aluminum oxide bench grinding wheel is ideal for sharpening carbide tools, saws, lathe tools, milling cutters and masonry drill bits. Also use for cast iron, stone, glass, rubber and non-ferrous metals. Universal nested busing fits bench grinders with the following standard arbors: 1-Inch, 7⁄8-Inch, 3/4-Inch, 5⁄8-Inch, 1/2-Inch. Leaves a medium finish. Measures 6-Inch by 1-Inch with 1-Inch arbor.