Hitachi 314063 5-Inch Sanding Disc with CP20 Grit, 10-Pack Has a CP20 grit that is used for sanding surfaces of cast-iron, non-ferrous metals, slate concrete, brick, and painted surfaces The choice of most woodworkers because of it's long-lasting durability and fine material Delivers unrivaled quality, precision, and power to bring the the high performance the industry demands This is a 10-pack of sanding discs for grinders Comes with a 30-day limited warranty