... 14-457mm 2)Length:Max 16 meters 3)T.H:0.6-16mm 4)Certificate :ISO,BV,SGS BS 1139 ... BV ,etc . Outer Diameter1/2" to 16" ( 20-457mm )Wall thickness2.0-16mmLength Max 16 metersStandardGB ,ANSI ,ASME ,ASTM ,JIS ,DIN, BS ... ,boilerheat ,exchanger ,shipbuilding ,construction ,etcEndsplain ends or threaded with socket and plastic caps Surfaceblack painted Tachnicalhigh - frequency weldedIntroduction of company ...