Turn your Dremel rotary tool into a powerful rotary grinder with the Silicon Carbide Grinding Stone. Tougher than aluminum oxide bits, Dremel's Silicone Carbide Grinding stones are designed for use on hard materials such as glass, ceramics, stone, porcelain and non-ferrous metals. Ideal for sharpening, deburring and for general purpose grinding and for projects like removing stilt marks, clearing excess glaze on ceramics, and glass engraving. The 25/32 In. (19.8 mm) disc shape of the grinding stone can be used on conic and flat surfaces.