1)Suitable for conveyance of gas, petroleum, fluid, and electricity 1) Outside diameter: 20 - 1, ... finish: black, blank, bright and galvanized, or paintedC: Length of each pipe: 500mm-16,000mmD: Steel grade: 10#, 20#, A106B, A53B, Q195 ... etc Product NameZinc Coating Steel PipeBrandSUNRISESpecificationOD 33mm - 406mm(1”~16”) with thickness of 3~30mmStandardGB/T8162,GB/T8163 and DIN/JIS/ASTM ...