X-Acto Retractable Utility Knife is a basic but effective box cutter knife. Designed to cut through heavy-duty materials, this retractable utility knife is a reliable addition to your tool belt. Use to cut all grades of paper, mat board, foam board, delicate fabrics, sheet metal, plastic and more. Plastic handle is contoured for a steady grip. Push-button slide adjusts exposed blade length. Blades (sold separately) fully retract into handle for safety.