Hitachi 314055 4-Inch Sand Disc with CP36 Grit, 10-Pack Has a CP36 grit that is used for sanding surfaces of cast-iron, non-ferrous metals, slate concrete, brick, and painted surfaces Has a 4-inch diameter and works best with the Hitachi G10SR grinder This a 10-pack of sanding paper Built to offer long-lasting power and performance Comes with a 30-day limited warranty