Some might wonder why I would lock my bike to that nice tree instead of that steel post...
Seeing that the post was a little askew I checked it when I rolled up... I was able to pull it out with no effort at all.
This may have just been due to the poor condition of the post but the design is such that anyone with a small adjustable wrench could loosen the single bolt that holds any of these in place and slip your bike off the pole.
I know that in some areas the posts are deliberately loosened so that any bike attached to it can be stolen rather quickly.