Tear through thick metals using this 4 in. 14 TPI METALWOLF .035 in. Thick WAVE EDGE Bi-Metal Reciprocating Saw Blade. The durable blade delivers the cutting speed and endurance needed for use on heavy-duty metal while offering up to 50% longer life. Its thin blade profile is well-suited for powerfully sawing through a wide range of metals. The steel backing is designed to reinforce the base for durability， strength， and reducing breakage.