CGW Coated Abrasive Flap Disc, Contaminant-Free Compact, 4-1/2 in Disc Dia, 5/8-11 Center Hole Thread Size, 80 Grit, Medium Grade, Z3 Zirconia Alumina Abrasive, Type 29 Conical Disc, Cotton/Poly Backing, 13300 rpm Maximum, Blue