Diablo DS1212BW5 Reciprocating Saw Blade, 6/12 TPI, Bi-Metal, Perma-Shield | Diablo's reciprocating saw blades are specifically designed for maximum performance in nail embedded wood applications. These high performance blades feature bi-metal technology that delivers up to 5X longer life of standard blades on the market. Diablo's patented variable tooth technology provides faster cuts with less vibration.