They come with security bolts I have them on mine.My point is that the security of the brace with standard bolts is weak. I rec'n I could remove the 4 bolts in less than a minute with an Alan key. The same as a lock and chain. It's no good putting the chain through a part that you can remove in 30 seconds with a standard tool.
As Matty says, some security bolts would make it that bit harder to remove.