"It's a modular tool, basically a wrench. Each part is just a piece of metal on its own, totally harmless. But if you assemble it the right way, it can serve as self-defense. Still, as it is now, it's just a regular tool.
You can even use a single piece as a thin two-finger knuckle with a palm rest. If you sandwich 2-3 pieces together, it becomes a stronger two-finger setup. Combine two pieces side-by-side, and you get a three-finger knuckle (no pinky). For a full four-finger knuckle, you can assemble three pieces, or go for four pieces to make it thicker and more solid. The kit includes all the bolts you need to configure it however you like.
The price is for one module. You can choose and buy as many as you need to create the perfect tool for your needs."