Professional flooring installers will love the world famous MAde in USA Personna Blue Carpet Blade. Ground for a great balance of sharpness and durability, this slotted carpet blade cuts through the toughest materials. Carpet Blades packed in a safety dispenser. These carpet blades fit all standard fixed blade, retractable and folding.carpet knives and also fit all standard loop pile cutters, cushion back cutters and more.