Are you a climber? Or maybe you just want an excuse to throw a rope over a wall and start climbing it. Either way, the Cyfie Stainless Steel Folding Grappling Hook is a pretty interesting product. (Here's another magnetic grappling hook that's a bit more lightweight and portable.)
The climbing carabiner is a strong, stainless steel magnetic hook. It folds in upon itself, and can hold up to 770 pounds. It's magnetic, and can be configured to grab things or simply just hold on tightly to whatever you want.
