This part of ISO 603 specifies the nominal dimensions, in millimeters, of:
— Type 6: Straight cup wheel
— Type 11: Taper cup wheel
— Type 27: Depressed centre grinding wheel
— Type 28: Depressed centre grinding wheel ?cone shaped
These bonded abrasive products are intended to be used for deburring and fettling/snagging of any surface of a workpiece using hand held grinding machines (angle grinder). The workpiece is fixed, the grinding machine is guided by hand.