3M Fiber Disc 7" x 7/8" - 50 gradeSold in sets of 1 Rapidly cuts carbon steel Premium mineral excels at heavyweight applications such as weld grinding, beveling, and edge chamfering 3M Precision Shaped Grain yields higher cut rates while completing more parts per disc than conventional discs Long lasting abrasive helps reduce cost Stiff fiber backing and strong resin bond provide durability and tear resistance Compatible with 3M disc pad face plates and hubs (sold separately)