With  Ø 114 mm and thickness of 2.2 mm steel tube (to pipe quality which conform to the BS1387-1985 standard requirement, technical standards comply with the BS1387-1985 requirements), surface spraying the United States again dupont outdoor environmental protection polyester powder bead light, high temperature curing, smooth surface, ultraviolet light resistance, and a strong ability of bright color, is not easy to fall off, corrosion resistance; Spraying equipment USES the computer control of south Korean import electrostatic powder spraying device, powder recovering the small whirlwind and import filter heart, and high efficiency, no pollution