The Ax Sawzall blades have been engineered to deliver the fastest cuts, longest life, greatest tooth durability and quickest plunge cuts of any wood demolition blade on the market ; NAIL GUARD ; Ordinary teeth deliver either speed or durability ; NAIL GUARD solves this trade-off with an aggressive 5 TPI pattern for faster cuts and a unique design that protects against tooth fracture ; FANG TIP ; Ordinary tips bounce or skate on the work piece ; FANG TIP bites into the wood on first contact ; A thicker, more rigid blade body resists fracturing and bending for maximum durability ; The 1'' tall blade body reduces blade twisting for straighter, more accurate cuts ; Matrix II bi-metal teeth for greater durability