1) Fix the roof bracket on the roof via self-tapping screw or hanger bolt.
2) 4 kinds of L foot height to meet different demand of heat-evacuation under solar panels.
3) Material: aluminum 6005-T5.
Hanger Bolt apply to install on both wooden rafter and steel purlin. Both types can be applied with L Foot and plate. There are three sizes most common use, M10x200mm, M12x200mm and M12x300mm Hanger bolt.