Walter Type 27 high performance depressed center grinding wheel for use on steel and iron. Formulated for safety and high performance in a wide range of metal grinding operations. Made from highest quality abrasive grain with greater hardness and wear resistance, they grind welds down fast and with less effort. Its breakthrough performance sets new standards for general purpose grinding of steel. High performance wheels grind off metal faster. Smooth grinding with an aggressive, controlled bite. Extra long wheel life. Perfectly centered wheel each and every time for best performance.