3M™ Precision-Shaped Grain (PSG) maintains super-sharp points that cut exceptionally fast with less pressure|Disc life is significantly longer, completing more parts per disc and requiring fewer disc changes|?Grinding aid incorporated on the disc minimizes grinding temperatures for stainless steel and other heat-sensitive alloys|Roloc™ quick attachment system provides for easy disc changes between grades or applications|Backing supports medium to high pressure grinding applications and 2-ply construction provides added durability for edge work