What to grow in greenhouse

Sorry for not posting in right section ( newbie)
Well the greenhouse dismantle proved to be more difficult than I thought, hence all afternoon outside getting wet through ( it was, as my Mum used to say, the rain that wets you lol) the job was abandoned... light stopped play.
Luckily the lady is very understanding and allowing me to go back tomorrow to try again.
Got all the glass out no problem but I thought they had nuts and bolts??? wrong square nuts and the bolts with 2 flat sides and the other 2 rounded.

Is there a tool to get these off?
I realise this isnt in the right section either but I am just following on from the original post.
Thanks