The IRWIN 6” Self-Retracting Safety Knife automatically returns the spring-loaded blade into the housing when not in use to reduce injures. This utility knife / box cutter has an ergonomic grip for increased comfort and an improved cutting angle. More versatile than traditional safety knives the IRWIN Safety Knife features two blade operating positions, a 2mm extension for box cutting and a fully extended position for general use. Tool-free blade change feature.