Diablo, 10 Pack, 9'' x 5-7TPI, Carbide Tipped Nail-Embedded Wood Demo Demon Reciprocating Blades, Specifically Designed For Maximum Performance In Nail Embedded Wood, High Performance Carbide Tipped Blades Deliver An Unmatched 50x Longer Cutting Life Than Bi-Metal Blades In Nail Embedded Wood, Patented Variable Tooth Technology Provides Faster Cuts With Less Vibration.