oil casings 1) Standards: ASTM/ASME ,GB,JIS,DIN,API5L, 2) O. ... .:0.205-0.352'' 4) Length :R2.R3 oil casingsOil casings specification:Standard : API5L API5CT /ASTM/EN/DIN/GBPlace of origion ... hope establish long&mutually benificial relations with all friends oil casings