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prevent heat loss
Adding cobalt can improve red hardness and heat resistance
tidy up any job made from box section
Thread Diameter:5mm / 0
is in size of : 125mm(4 15/16-inch) inner dia
160mm 6-5/16" M42 High Speed Steel Bi-Metal Hole Saw Drill Bit for Wood Plastic M10*27 D60*H50 prevent heat lossThe bi metal hole saw combines high speed steel and cobalt. The hole saw body is made of superior grade M42 high speed steel, which has excellent hardness, wear resistance, and heat resistance. The cutting edges or teeth are made of a cobalt alloy, which further enhances hardness and heat resistance. The sprayed coating resists rust and corrosion. Sharp toothed edges allow for smooth, fast and easy cuts. Bi metal hole saws have larger numbers of