Diablo, Demo Demon, 3 Pack, 12", 6 TPI, Carbide Tipped Reciprocating Blades, Variable Tooth Design Are Specifically Designed For Maximum Performance In Nail Embedded Wood, High Performance Delivers Unmatched 50 Times Longer Cutting Life Than Bi-Metal Blades In Nail Embedded Wood, Patented Variable Tooth Technology Provides Faster Cuts With Less Vibration.