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. Blades fully retract into handle for safety. - 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.