Craftsman 9" x 6tpi Recip Blades Bi-Metal 10-30233 5pcs Craftsman 9" x 6tpi Recip Blades Bi-Metal 10-30233 5pcs Bi-metal reciprocating 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 Blade Length: 9"