Features and Benefits: Universal 2 Notch Utility Blade Heavy duty .025 thick steel Made from high carbon knife steel Can be used in all standard utility knives Card of 5 blades American Line brand of heavy duty utility blades are manufactured from high carbon knife steel for rugged use and durability. Precision ground to have the ultimate initial sharpness for cutting material and not tearing material. Standard 2 notch universal design allows American Line blades to be used in any manufacturer’s standard utility knife.