Rapid Edge Easy Change Heavy-Duty Utility Knife with Soft Comfort Grip, String Cutter and 3 Rapid Edge Serrated Razor Knife Blades PATENTED SERRATED BLADES: Our Rapid Edge blades feature multiple cutting edges to distribute friction, allowing each one to cut faster and last longer than a traditional box cutter knife blade HEAVY-DUTY DESIGN: The knife features a durable full metal handle that is designed to stand up to tough jobs like removing carpet and drywall repair EASY BLADE CHANGES: The retractable knife is designed to make blade changes quick and easy. Just release and hold the button to swap in a new blade ERGONOMIC HANDLE: The handle of the box cutter knife is curved to sit naturally in any hand, and it has soft grips at the top and bottom to keep it comfortable to use during long days on the job BUILT-IN ACCESSORIES: The string cutter notch allows you to safely trim long strands of twine or wire down to size, and extra blades can be stored in a compartment inside the handle