Ready for this one? An iron fence is an iron fence. Don't you love it when it's straightforward?
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Be careful though, 鉄 is normally read as てつ, but in this case it is shortened to てっ.
How do you feel about enclosing that with an iron fence?
I have to repair the iron fence as soon as possible.
Look! Something's caught on the iron fence.