Diablo next generation Steel Demon reciprocating saw blades with Full Contact Arched Design are specifically designed for maximum performance in metal cutting applications. The blade’s Full Contact Arched Design with ultra hardened cutting edge provides faster cuts in fewer passes resulting in less heat build-up to deliver 5x longer cutting performance than those of standard blades. Diablo STEEL DEMON® Bi-Metal Reciprocating Blades deliver 5x the performance of standard blades. The ultra hardened edge is created through a unique heat treatment process that optimizes the bi-metal teeth durability.