American standard seamless steel pipes and we have API certificate Type:API 5CT J55 petroleum casing pipeOD:20mm-2900mmWall thickness6-60mmStandardASTM A53, API 5L, DIN1626,JISG3452,JSSG3457MaterialGR.A GA.B X42 X46 X52 X56 X60 X70 J-55 N-80PackingHexagonal shape bundles wrapped with strong steel strip and plastic cap, Besides that, we can also make to the customers’ requirement. ...