Work smoothly and efficiently with a self-loading utility knife. The Workpro 18 mm Self-Loading Snap Off Utility Knife offers a smooth cutting performance with its unique snap off blade design, 5 self-loading blades, and positive blade auto-lock. It also features an ultra durable, stainless steel flute. Simply extend the dull blade edge outward and break off the segment to expose a sharp, new edge. Retract blade when not in use. Perfect for around the home, on the job, and outdoor needs.