Description of IRWIN Tools Portable Blade 8 Inch Cutting Tools
Shatter-resistant, Bi-Metal construction extends the life of the blade. Made from industrial grade High-speed steel with 8% heat- and abrasion-resistant cobalt for added durability. Electron beam weld construction provides flexibility.
As my tests showed, this blade was a complete waste of money .It was marketed as a high-quality cutting tool, but it fell short in every way. The teeth were dull and wore down quickly, and the blade was flimsy and lacked durability..