3M precision-shaped ceramic grain (PSG) maintains super-sharp points that cut exceptionally fast with less pressure * PSG runs cooler, reducing metal discoloration/oxidation and the chance of heat related stress cracks * Flaps grind and blend in a single step * Durable Y-weight poly-cotton backing delivers controlled, even wear for full use of the disc on low to medium-high pressure applications * A grinding aid incorporated on the disc minimizes grinding temperatures for heat-sensitive alloys like stainless steel, titanium, and nickel alloys