Bosch Holesaw (Dia) 64mm. This 64mm holesaw from Bosch is suitable for suitable for use with aluminium alloyed & non alloyed non ferrous metals steel cast iron acrylic glass chipboard laminates hardwood plasterboard plastics & thin metal plates It's progressive tooth pitch means it's most suited for aluminium alloyed & non alloyed non ferrous metals steel cast iron.