Diablo, Demo Demon, 3 Pack, 9'', Carbide Wood Reciprocating Blade, Variable Tooth Design Specifically Designed For Maximum Performance In Nail Embedded Wood, High Performances Deliver An Unmatched 50 Times Longer Cutting Life Than Bi-Metal Blades In Nail Embedded Wood, Patented Variable Tooth Technology Provides Faster Cuts With Less Vibration.