3M Precision Shaped Grain (PSG) maintains super-sharp points that exceptionally fast with less pressurePSG runs cooler and disc life is significantly longer, completing more parts per disc and requiring fewer disc changesStiff fiber backing and a strong resin bond provide durability and tear-resistance for heavyweight applications such as high-pressure weld grinding or bevelingGrinding aid incorporated on the disc minimizes grinding temperatures for heat-sensitive alloys0