The below is that I can advise you our hot selling roof solar mounting accessories: aluminum solar rails-DR solar rails/SR rails/XR rails, they are used different nuts and theirs size are different, looks like but not different.They are very easy to install and only need to slide the nuts then fix tight that is okay. If you are puzzled, contact me and I will show you more information about the different aluminum solar rails.

Then, we have various factory price solar clamps including solar mid clamp/solar end clamp,these mid clamp and end clamp usually to fix the solar rails and solar panels, let solar panels tighten for the solar mounting structures,these solar clamps are also easy installation and cheapest.Different solar clamps used are the different nuts, but they are all easy installation,because our design concept is simplicity, convenience, quick installation and affordability. 
Here I don’t show you the pictures of our solar clamps because we have many many various different solar clamps,if you want to know more,you can also see our catalog and choose you want, or you can send us you wanted solar clamps, we also can do for you according to your design drawings, our factory can do OEM/ODM for the all solar pv mounting brackets.

For any inquiry for solar panel mounting system, pls contact us, E-mail: sales@artsign.net.cn, Whatsapp / Wechat / Skype: +86 18396005809, thank you.