NT snap-off blades for heavy-duty utility knives. 10 refill blades per set, packed in a protective plastic container. These professional blades are made of high quality carbon tool steel and produced through multiple stages of precise process to obtain the ultimate sharpness and optimum edge-retention. 10 carbon steel blades per pack. Good for DIY projects, construction such as drywall, roofing, flooring, Industrial application, warehouses, factories, etc. Made in Japan.