3M General purpose Depressed center grinding wheel is a heavy-duty wheel designed to be used at the beginning of a project, as a grinding wheel, it's often the first step in a sequence. Use this wheel for rough grinding applications like beveling, slag removal, weld grinding and edge work on a variety of metals. - Depressed center wheels are an excellent economical solution for general purpose grinding and cutting applications on steel. Type 27 for high rate stock removal.