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. Cuts composition materials, plastic, pipe, carbon steel, and stainless steel. Includes 11 blades suitable for the most common cutting applications. See product description for a complete list of included tools. IRWIN TOOLS Reciprocating Saw Blade Set, 11-Piece (4935496)