One of the heaviest rails available inthe market today
14 ft standard Lenght
We recommend max L Feet distance to be 5 ft 
2 Rails for 60 cell modules
3 Rails for 72 cell modules
With these rails you will need L feet Lfeet hardware UFO midclamps and Stopper sleeve for end clamp 
you will also need BOSS splice bars and Ground lugs from ground wire. 
Rails spec PDF