SAIT Ovation Attacker Plus+ Coated Abrasive Flap Disc, Close High Density, 4-1/2 in Disc Dia, 5/8-11 Center Hole Thread Size, 36 Grit, Coarse Grade, Zirconia Alumina Abrasive, Type 27 Flat Disc, Y-Weight Polyester Cotton/Plastic Backing, 13300 rpm Maximum, Blue