The Slice®SPG10554 Auto-Retractable Utility Knife responds to customer demand for a long blade to cut through thick materials, including triple-walled corrugated. When your cut is finished, the blade pulls back to keep you safe. Rotate the blade edge quickly and without tools to adjust for right- or left-handed use. As with all our blades, the retractable utility knife blade is non-conductive, chemically inert, and never rusts.