Diablo, 10 Pack, 6'' x 5-7TPI, Nail Embedded Wood Reciprocating Blades, Carbide Tipped Reciprocating Blades With New Variable Tooth Design 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.