Detailed Product Description WT4mm4.5-5.5mm6-20mm20.5-26mm26.5-30mmOD68mm..×70mm..×73mm..×76mm×××80mm..×83mm..×89mm×××95mm×××102mm×××108mm×××114mm×××121mm.××127mm.××133mm.××140mm..×146mm..×152mm..×159mm..×168mm..×180mm×××194mm×××219mm..×××245mm×××273mm...××More detail:1. Standard: GB/T8162, GB/T8163, GB/T3087, GB/T 17396, ASTM A53, ASTM A106, ASTM A210, EN10210, EN10297, EN10216, DIN1629, API 5L, ...