Hitachi 314087 7-Inch Sanding Disc with CP30 Grit for S18SA, 10-Pack Has a CP30 grit that is used for sanding surfaces of cast-iron, non-ferrous metals, slate concrete, brick, and painted surfaces Has 7-inch diameter and works best with the Hitachi S18SA disc sander/polisher This a 10-pack of sanding paper Built to offer long-lasting power and performance Comes with a 30-day limited warranty