Irwin 6 Piece U-Shank Jigsaw Blades *Blade Material: Carbon Steel *Shank Type: T-Shank *Product Type: Jig Saw Blade Set*Number in Package: 6 pk *Flexible: No *Includes:  (1) 3-1/4" 20T milled, (1) 3-1/4" 10T milled, (1) 4" 6T fleam ground, (1) 4" 10T fleam ground and (2) 4" 10T milled blades * Precision ground teeth for smooth cutting in hard and soft woods, plastics, laminate, particle board and plywood *   Metal cutting, fully hardened teeth for cutting ferrous and non-ferrous metals, aluminum and sheet steel