Electronic beam weld for stronger, longer lasting teeth. 8% cobalt keeps teeth sharp longer. Bi-metal construction for faster cutting and added durability. Precision-set teeth for faster, smoother cuts. For heavy-duty and demolition applications in wood and metal. Use with materials 3/16-inch (5 mm) and thicker. IRWIN Tools Reciprocating Saw Blade, Demolition, 9-Inch 10 TPI, 5 Pack (372960P5)