Made from 1.23mm thick M42 bi-metal, the Spyder blade is the only reciprocating saw blade that makes easy plunge cuts and saws in both directions. The Spyder blade is like getting 2 saw blades in 1. The unique double tanged shank allows for heavy cutting on both sides of the blade. Rounded tip with teeth allows plunge cuts, eliminating the need for pilot holes. Great for framers, plumbers, electricians, and DIY.