Stanley's classic 99 utility knife is sharper than regular heavy duty blades. It has blade storage in the handle, three-position retractibility and has an interlocking nose to hold the blade. In addition to these, the knife has a multi position blade slide facility. The knife has been included with 3 11-921 heavy duty utility blades which a have been made with an extremely durable combination of a carbon alloy steel. The knife has a lifetime warranty and can be used to cut a variety of things including paper, drywall, cardboard etc.