CGW Coated Abrasive Flap Disc, Contaminant-Free Premium Regular, 5 in Disc Dia, 5/8-11 Center Hole Thread Size, 40 Grit, Medium Grade, Z3 Zirconia Alumina Abrasive, Type 29 Conical Disc, Cotton/Heat Treated Poly Backing, 12200 rpm Maximum, Blue