Depressed Center Cut Off wheels (T27) are designed to increase the efficiency of the right angle grinder for cut-off applications and are perfect for a fast cut while retaining excellent wheel life. The aluminum oxide grain combination in the wheel offers aggressive cutting action on the workpiece. These depressed center right angle grinder wheels are for cutting-off only applications where minimum material loss is desired. This depressed center cut-off wheel is ideal for general purpose grinding and cutting applications. It provides high cut rates and long life on all types of ferrous metals, stainless steel, alloy steels, and cast iron.