... with advanced heat treatment,and all size of sucker rod available in grade C,D,KD,H, L,HY and This company is ... one of the main producers and providers of sucker rod in China ... passing "Dual Registration"by API in China. product gradeC,D,KD,H, L,HY and Polished roddiameter(mm) 5/8"3 ... 26.25' 25' or 26.25' 25' or 26.25' sucker rod and sucker rod coupling