The TORCH with NITRUS CARBIDE SAWZALL Blade for Cast Iron and other thick metals delivers the fastest cutting, and longest life with a breakthrough Carbide Technology. Our NITRUS CARBIDE reciprocating saw blades are engineered to dissipate heat better than any other demolition blade for faster cutting. The TORCH with NITRUS CARBIDE for Cast Iron delivers 5x life versus carbide teeth blades in cast iron. This 8TPI blade is ideal for the fastest, smoothest cuts in hard cast iron, stainless steel, black pipe, rebar, & angle iron.