Here's something similar. Designed for water rescue, though. Very cool with the right training, but you definitely need to practice with them. Bring up a CrossLine to a group of kayakers and they'll usually abhor a "grappling hook".


The website includes some good videos too.

It's also meant to snag other lines, but I think it's rated at 800 lbs breaking limit. Also not cheap, I think they're near $200. But it includes a pretty sweet throw bag (even without the hook) and a good spectra core rope.
J