3M Precision-Shaped Grain (PSG) maintains super-sharp points that cut exceptionally fast with less pressure The disc has an extended life, 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 3M™ Cubitron™ II Roloc™ Durable Edge Disc 984F's quick attachment system provides for easy disc changes between grits or applications ?Backing supports medium to high-pressure grinding applications and 2-ply construction provides added durability for edge work 3M™ Cubitron™ II Roloc™ Durable Edge Disc 984F offers a high-level solution for tackling medium to high-pressure grinding applications when a smaller-sized disc is needed. It excels in stainless steel, cobalt chrome and nickel alloy applications.