CNBTR 2.35mm Shank Dia.16mm-40mm Silver Diamond Cut Off Wheel Discs Blades Rotary Tool Accessories with Mandrel Pack of 10 Made from strong carbon steel, durable and firm. Can cut polished glass Jade ceramic tile materials such as marble Need to use distribution or hanging grinding Must pay attention to the handle clip with as many as possible into the electric grinding and don't only a little