No they don't just slide out.
They have two extensions (?) perpendicular to the bar itself, so that you can pinch them with your fingers. Very helpful but it prevents the bars from slipping out.
There must be a way to remove them somehow but I don't see it, unless they are screwed on?
Anyone knows how to remove these "adapters" from the Baltic beads of rice bracelet? Wanted to try it on a different watch.