Blades are bi-metal technology with a high-speed steel cutting edge that stays sharp longer. Fits most standard utility knives and are flexible to last longer.
IRWIN 2082300 Utility Knife, 1-1/2 in W Blade, Bi-Metal Blade, Ergonomic Handle, Orange Handle
IRWIN 2082101 Utility Knife, 2-1/4 in L Blade, 1-1/2 in W Blade
IRWIN 2087100 Utility Blade, Carbon Steel, 2-Point
Xcelite XN100 Hobby Knife, 5-13/16 in L Blade, Steel Blade