Diablo, 10 Pack, 12'' 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 20x Longer Cutting Life Than Bi-Metal Blades In Nail-Embedded Wood, Patented Variable Tooth Technology Provides Faster Cuts With Less Vibration.