Diablo DS0920BF5 9 in Diablo Bi-Metal Recip Blade for Thin Metal (Less than 1/8 in) (5 pk) Metal (Thin Metal)Diablos reciprocating Saw Blades are specifically designed for maximum performance in metal cutting applications. The blade’s ultra hardened cutting edge delivers up to five times longer life than those of standard Blades. Dual Tooth design features a double tooth configuration with small gullets for faster material removal and extra durability. Perma-shield coating protects the blade from heat, gumming, and corrosion1 in. Demolition body for straighter cuts with less vibrationUltra hardened edge increases the hardness of the cutting edge to a rockwell hardness of HRC 62 versus HRC 55 for standard bladesA one-of-a-kind tip design that enables faster and easier plunging