WORKPRO 18mm Heavy Duty Retractable Utility Knife Snap-off Box Cutter 10PC Blade

18MM SK5 Blade: WORKPRO utility knife are made from SK5 steel, which is greater in edge retention, thickness, sharpness and durability. Each knife blade is made up of 8 parts, if the blade is worn, it can be snapped off along the scratch with the plastic groove at the bottom, revealing the new sharp edge.