Also sometimes called a box cutter, a razor blade Knife, a carpet Knife, or a stationery Knife, is a common tool used in various, warehouses, mail-rooms, trades and crafts for a variety of purposes. These Knives generally consists of a simple yet durable handle, usually flat, and typically made of either metal or plastic. our Knives use standard razor blades. The person using the Knife can manually adjust how far the blade extends from the handle, so that the Knife can be used to cut the Tape sealing a corrugated carton without damaging the contents of the package. On most of the Knives, when the blade becomes dull, it can be quickly reversed, discarded or switched for a new one. Spare or used blades are stored in the hollow handle, and can be accessed by removing a screw and opening the handle. Please be sure to use safety eyewear whenever using a Utility Knife.