3M Cubitron II Fibre Disc 982C offers optimum performance and productivity on carbon steel with our exceptionally high-performing 3M Precision Shaped Grain combined with a stiff fiber backing, and generates up to twice the cut-rate, durability, and life of other fiber discsall with less grinding pressure. 3M Precision Shaped Grain maintains super-sharp points that cut exceptionally fast with less pressureDisc life is significantly longer, completing more parts per disc and requiring fewer disc changesTriangular-shaped ceramic grain wears evenly, runs cool, and optimizes mineral breakdownStiff fiber backing and a strong resin bond provide durability and tear-resistance for heavyweight applications such as high-pressure weld grinding and beveling78 inch center hole mount is compatible with 3M Disc Pad Face Plates and Hubs, and requires the use of a disc retainer nut (all sold separately)