... .ASTM A53,ASTM A500, ASTM A513, 2.ANSI C80.1 ,ANSI C80.3 3.BS1387, BS1139 4.EN10219,EN10220, ... EN10240,EN10255 5.DIN2440,DIN2444,DIN2458 6.AS1163,AS1074,AS2556OuterDiamete: 1/2"to16"Wallthickness: 0.6mm-20mmLength: Max 12metersSdandard: GB ... the ISO9001:2000 strictlyO.D.D.N.W.T.1/2"21.3mm0.6mm-3.0mm3/4"26.7mm0. ... .1mm3.2mm-16mm10"273mm3.2mm-16mm12"323.8mm6mm-18mm14"355.6mm8.0mm-18mm16"406.4mm8.0mm-20mm