Tianjin Rainbow Steel Group has complete cold forming, punching and welding equpment and rich experienced staff team. The products in clude ASTM standard WF beam solar foundation piles, cold-formed C/U-type ground piles, support rails, and torque square tubes/round pipes for solar trackers and various tamping and welding spare parts. The products are widely used in ground PV mounting system, slar tracker system, fishery solar mounting system ans PV agricultural greenhouses, etc.