This CRL Heavy-Duty Retractable Blade Utility Knife is a quality knife designed to better fit the hand with vertically recessed ribs for amore comfortable grip. The heavy-duty, diecast zinc handle features a safety nose with top and bottom over-lap, providing additional security by preventing the blade from slipping between each half of the handle. A zinc retractor makes for smoother operation and has three cutting positions. It is supplied with three heavy-duty blades, and uses any of our CRL Utility Knife Blades, which must be purchased separately.