Finder Cutter Utility Knife 18mmAuto-Lock Professional Heavy Duty Cutter Knife. 18m Wide Blade Features:High quality utility knife (25kgs of force)Snap-off dull blade to instantly expose a new fresh sharp point.Easily slide the “Blade Lock” forward to advance blade. After last tip is used, slide “Blade Lock” forward and remove used blade. Slide the “Blade Lock” all the way back to automatically load nest blade.