... made by a steel pipe with diameter of 114 mm, wall thickness of 2.2 mm, quality and technical standard of which have ... a steel pipe with diameter of 60 mm, 48mm, 38mm, 32mm, 28mm, wall thickness of 2.5 mm, quality and technical standard of ... powder coating which is friendly to the environment and solidified at high temperature. With smooth surface and excellent anti-ultraviolet property, our product has ...