A36T - Fast Cutting. Aluminum oxide grain. Hard bond for aggressive cutting on rough applications. Ferrous metals (iron, steel, welds, etc.). Stainless steel. Specifications: Max RPM - 30558. Tech Info: 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.