IRWIN 50-Pack Carbon Steel Utility Knife Replacement Blade

The IRWIN Blue Blade bi-metal utility blades stay sharper 3X longer than traditional IRWIN carbon blades. As the name implies, bi-metal blades are produced through a patented process of combining spring steel and high speed steel, each with its own attributes and benefits, making them virtually shatterproof. Features patented bi-metal technology that sets new standards of performance Spring steel body delivers superior flexibility to prevent breaking High speed steel cutting edge stays sharp longer Fits most utility knives CA Residents: Prop 65 WARNING(S)