CGW Coated Abrasive Flap Disc, Contaminant-Free Compact Wider/XTRA Material, Series: Ultimate, 4-1/2 in Disc Dia, 5/8-11 Center Hole Thread Size, 80 Grit, Fine Grade, Z3 Zirconia Alumina Abrasive, Type 27/Depressed Center Flat Disc, Poly Cotton Backing, 13300 rpm Maximum, Blue