It goes on the bar, you swing the thing and it squeezes/locks on the bar.
Pros; keeps plates on the bar
Cons; it keeps weights on the bar.. the bars on my fucking throat.. halp me, stop snap chatting you idiot!

Fits snug, no needing to slide it back in after a few cleans.

I’ve owned several regular spring collars and used different collars in the gym. These are by far the best I’ve used.

We love the Barbell Collars from SoFlete. They are very easy to use and the stay in place. We bought 2 sets!!

These things are so tight I get a workout taking them on and off the bar. But the weight won’t move.