Diablo Demo Demon, 5 Pack, 9" 8/14 TPI, Reciprocating Saw Blade, Full Body, Specifically Designed For Maximum Performance In General Purpose Nail Embedded Wood & Metal Applications, Features Bi-Metal Technology That Delivers Up To 4 Times Longer Life Of Standard Blades, Special Coating To Reduce Friction & Heat Build Up, Ultra Hardened Bi-Metal Teeth, Plunge Tip Design.