I recently bought two different brand (Creston and Ingco) utility knives (Box Cutter/ Razor Knife) with snap off (break off) razor blades only to discover I had no idea how to change the blade. Although I have been buying these things for many years without ever having a problem changing the blade, all of the sudden something had changed. It was different and it was confusing and frustrating until I figured it out. Once I did figure it out it was easy! I will show you so that you don’t have to go through the same frustration that I did.