Heavy-duty utility knife with an auto-lock mechanism delivers extra productivity and savings with the ease and speed of snapping off a blade segment to renew its cutting edge. Simply slide the blade disposal container off the knife, insert the dull blade into the end of the container and snap it off. The old blade disappears into the container, and a sharp new blade is ready for use. Storage container holds up to 16 snapped-off blade segments for thousands of cuts before emptying is needed. Utility knife is perfect for flooring, drywall and roofing repair or replacement applications.