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 in tall blade body reduces blade twisting for straighter, more accurate cuts Matrix II bi-metal teeth for greater durability