The Slice auto-retractable utility knife features a long blade to cut through thick materials, including triple-walled corrugated. When your cut is finished, the ceramic safety utility knife blade pulls back to keep you safe. Rotate the blade edge quickly and without tools to adjust for right or left-handed use. The retractable utility knife blade is non-conductive and never rusts. Includes 1 double-sided rounded-tip safety blade. Replacement blades available 3 ea/pk.