I'm not sure if your year is the same as my '04, but I would assume they are aftermarket Caster/Camber plates as on mine, the factory ones had to be drilled out to be removed.
Just make sure you put pressure under the control arm, to put pressure on the struts. To get the top nut off of the strut, you will have to either have an impact wrench, or manage to hold the strut shaft at the same time as trying to loosen the top nut. It is a pain in the ass, I recently installed my aftermarket Caster/Camber plates without an impact wrench and won't do it again, I went out and bought one. haha.
Make sure you mark where they're adjusted now, so you can get it to the alignment shop after you re-install. Do not release pressure on the control arm until after you have reinstalled the top strut nut. :thumbsup:
Again, I'm talking about an '04 New Edge, so I'm not even sure any of this is relevant to you. haha.
Here's a quick pic of what they look like on a New Edge: