PEARL BG634080 - 6 x 3/4 x 1 grinding wheel (For metal)Pearls bench grinding wheels are designed for use on work benches or floor standing machines. Wheels are not affected by water, oils or acids. Each wheel is balanced and ring tested. One size wheel can fit several different machines using the included bushing set. Use Aluminum Oxide bench grinding wheels for general purpose tool sharpening, light to heavy stock removal on ferrous metals carbon steel, steel and iron. Use Green Silicon Carbide bench