Norton BlueFire R884P Type 27 Flat Flap Abrasive Disc, 5/8"-11 Arbor, Zirconia Alumina Plus, 4-1/2" Diameter, 36 Grit (Pack of 2) High performance zirconia alumina plus abrasive for aggressive cut and long life Polyester flaps provides improved durability Semi-open coat retards loading on aluminum Durable, fiberglass back provides high strength, lightweight, absorbs vibration Applicable for grinding, stock removal, edge chamfering/beveling, weld blending, deburring/deflashing, rust removal, blending, cleaning and finishing