Size Matters - An A99 question......

I just downloaded the assembly manual for an A99 and what I am looking for does not seem to be written in there.

Does anyone know off the top of your head ... what is the max diameter pole that an A99 will mount to? I guess the basic thing is.... how wide are the U bolts that come with it...and I don't know.

Anybody?

Thanks in advance,
Bob