Heavy-Duty Retractable Blade Utility Knife is a quality knife designed to better fit the hand with vertically recessed ribs for a more comfortable grip. A zinc retractor makes for smoother operation and has three cutting positions. The heavy-duty, die cast zinc handle comes with three heavy-duty blades. A safety nose with top and bottom over-lap provides additional security by preventing blade from slipping between each half of the handle. The Heavy Duty Utility Knife Blades are easily replaceable.