Rapid Edge Heavy-Duty Die-Cast Utility Knife with LED Safety Light and 3 Rapid Edge Serrated Razor Knife Blades (1 Pack) 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. ALL-PURPOSE DESIGN: The retractable knife cuts through a wide variety of common household materials with ease, including cardboard, rope, rubber, roofing and carpet. LED SAFETY LIGHT: The LED light improves visibility in tight spaces and indicates when the blade tip is exposed, so you can be sure that it is retracted before sliding the knife into your pocket. DURABLE AND ERGONOMIC: Tough die-cast construction helps the box cutter knife stand up to everyday wear and tear, and it is shaped to fit comfortably in any users hand. SLIDE & LOCK ADJUSTMENT: An easily-accessible button allows you to shift quickly between different cutting depths, and a secure locking mechanism holds the blade firmly in place.