Menu Categories Irwin 2084100 5 Pack Utility Knife Bi-Metal Blue Blade 3 Packs Click Thumbnails to Enlarge Product description Irwin 2084100 Utility Knife Bi-Metal Blue Blade 3 (5 Packs) The Irwin Blue Blade is the revolutionary unbreakable utility blade. Its patented bi-metal technology sets new standards of performance, by providing an unbreakable blade that stays sharp 3 times longer. Aeronca If you have a question about one of our products, please email us. We check our email regularly, and try to get questions answered as quickly as possible. BC 5/26/17 AC