For slicing and cutting in metal,wood and plastic 32mm. Cut-off wheels make it easy to cut or slot bolts, screws, sheet metal, thin wood and plastic. Fiberglass reinforced cut-off wheels (426) and heavy duty wheels (420) are for tough applications. The cut-off wheel cuts only along its edge. Do not attempt to sand or cut curved holes. Use Dremel cut-off wheels with mandrel 402.