For slicing and cutting in metalwood and plastic 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 402shank diameter 32 mm working diameter 320 mm max working depth 140 mm maximum rpm 35000 1min