Going to steal a bike?
Not sure, when we cut my chain @ the shop, I think the arms were 4 feet long or more, and we had to put one arm on the cement.
I guess if I weighed above 200 lbs it would have been easier. A hardened 9mm diam link is a bit of steel, but not too hard to hacksaw if someone can clamp it.
I use chain 'caus my bikes rarely outside. Sleeps in my bedroom, goes into work with me.