Yeah, one of the initial officers described them as "hose clamps" and we all just ran with the screw type, and a lot of us pointed out how they wouldn't make a very good restraint.
But then Keith called them "something like a hose clamp if you will" and that makes me believe they were probably shackles. I could see where an officer might have called shackles hose clamps. That would make a lot more sense.
An example of shackles: (of course, sizing then becomes an issue... )
Also, shackles could be held shut with a zip tie, making them easy to remove with a quick snip.