Vermont American 30085 7-Piece Bi-metal U-shank Jig Saw Blade Set All-purpose cutting in wood, plastic and metal Bi-metal jig saw blades last 10 times longer than high carbon steel blades and twice as long as high speed steel blades A flexible, steel spring back extends the life of the blade, while super-hard high speed steel teeth provide a sharp, long-lasting cutting edge Fit all jig saws using 1/4" universal shank