This 2 notch utility blade provides carpet installers and flooring professionals with the perfect balance of sharpness and durability. When carpet and flooring installers are cutting flooring materials, like carpet, film, underlayment, pad and even cove base, toughness counts.And when used for drywall cutting and scoring, it's the same game. These Blue Utility Blades fit all fixed blade, retractable and folding utility knives.