Stanley 11-921 5-Pack 1992 Heavy Duty Utility Blades N/A Imported Carbon steel replacement blades for heavy-duty utility knives Engineered for general-purpose cutting Precision-honed edge for consistent and extended cutting life Durable carbon steel Super-sharp carbon steel blade provides heavy-duty durability Engineered for general-purpose cutting Precision-honed edge for consistent and extended cutting life Fits most standard utility knives Limited Lifetime Warranty