The AX with carbide teeth reciprocating saw blades are engineered to deliver long life in the toughest applications while being the fastest carbide-tipped reciprocating saw blades. The fast, aggressive 5 TPI (teeth per inch) blade design allows for fast cutting in nail-embedded wood and a wide range of residential material. Features Nail Guard which allows the user to rip nails, not teeth, delivering extreme durability. The Fang Tip provides fast plunging. Optimized for cordless reciprocating saws.