BIMETAL HOLE SAW is for working in cast steel and malleable cast iron, stainless steel, structural steel, alloyed and non-alloyed aluminium, bronze, cBi-metal construction. Special M-3 HSS cutting teeth. 4/6 T.P.I. variable tooth pitch achieves easy but fast cutting with less efforts; less vibration, less noise and increase life span. Tip teeth hardened for cutting any usual materials with a high wear resistance. Hole saw and arbor in two parts,so hole saws of different diameters can be exchanged and fitted more rapidily. For cutting steel, cast iron, aluminum, brass, wood, plastics .Dia.14-177mm (9/16" - 6-31/32") opper, PVC, acrylic, wood.