Havoc Utility Knife - Stainless Steel Blade, Nylon Fiber And Steel Handle, Integrated Carabiner, Slide Trigger - Closed Length 4”

These knives are small enough that I constantly keep on on each set of keys I have. They show the front side is plastic, but the back side is pure metal so it's very sturdy. They fit standard razor blades. The downside is that while I've tried to use it as a bottle opener the way the images show, that bit of metal is actually too thick and bulbous to grab any bottle I've tried so it's useless as a bottle opener. That's the only reason I'm giving it four stars instead of five. I have and will buy more eventually.