I don't think they get that big, but unfortunately I can't find any information about these guys. I have no clue what their exact species is. The biggest one I have and I have seen is about 1 - 1 1/2" across.
They dont seem to be agressive too anything, so that is good. I have never been stung by an anemone, I have never used gloves either. I have touched all of my anemones, and not one has ever stung me.
At the moment I only have a bicolor blenny, and he touches them here and there, including my condi, and none of them seem to pay any attention to him.
If you know anyone who has any extra knowledge of atlantic anemones, let me know I would really like to find out an exact species name.