United Abrasives- SAIT 23200 Type 1 6-Inch x 1/16-Inch x 5/8-Inch A36T Fast Cut-Off Wheels, 50-Pack Aluminum oxide grain. Hard bond for aggressive cutting on rough applications. Ferrous metals (iron, steel, welds, etc.). Stainless Steel Type 1 shape for square, burr-free cutting Externally reinforced with fiberglass layers to provide ultimate safety in a thin wheel Wide range of grit sizes available for aggressive action to burr-free cutting