... 5.21-16.13mm 3.Grade: J55,L80,N80,C90,P110 4.Fine Quality & Competitive price API 5L ... 5.21 - 16.13mm Grade: J55,L80,N80,C90,P110 Fine Quality & Competitive PriceAPI Casing CouplingStandard: API 5CTSize ... 16.13mmGrade:J55,K55,L80,N80-1,N80-Q,C90,P110 ---------------------------------------------------------------------------------------------------------------We are one leading manufacturer in the oil ...