M3/M42 High speed steel Bi-metal Hole Saws are rugged cutting tools designed to cut accurate holes in machinable materials up to 38mm/44mm thick.Ranging in size from 14mm to 210mm in diameter,they can be uses in portable electric,air tools,drill presses,lathes,boring mills,milling machines or any other machine which has a rotating spindle.Hole saws have 4/6 vari-pitch tooth design and are recommended for cutting steel and cast iron pipe,steel plates,aluminium,copper,brass,stainless steel,wood and plastics,furnished in standard size .