I have to agree with Schmit. It’s a great novelty item and perfect for hanging your keys off a belt loop on your pants. As far as actual usage, while it may resemble a locking “D” ring, all my carabiners have their black finish worn off all around the backside of the “D”, right where the blade tucks in on the Kershaw. I don’t think the rope would do very well rubbing across the backside of the blade.
I may have to pick one up just to check it out. Worst case scenario is I end up with a fancy keychain.