... HSS M42 8% COBALT FOR PROFESSIONALS HSS BIMETAL HOLE SAW*HSS M42 teeth electron welded to a ... extend the life of your hole saw by 500%.*Our HSS Bimetal hole saws with HSS teeth are ... to 210mm in diameter, they can be used in portable electric tools, air tools, drill press, lathes, boring ... machines, which have rotating spindles.*Our HSS Bimetal hole saws are recommended for cutting steel, cast iron pipe ...