3M Depressed Center Grinding Wheel: Type 27, 4 1/2" x 1/4" x 7/8", Ceramic, 36 Grit, Silver

Cool-cutting grinding wheels are made of ceramic abrasive to make quick, accurate cuts on carbon steel and stainless steel. Cool-cutting ceramic is a high-density grain that prevent loadings and keeps surface temperatures down when working with heat-sensitive materials such as stainless steel and aluminum. It has a longer lifespan than aluminum oxide and zirconia alumina and self-sharpens faster than other abrasives to remove material faster.