1. Up to API 11B Standrad 2. Competitive price and high quality Sucker Rod Couplings are manufactured according to API 11B Standard.We can supply sucker rod couplings as followings :Class T, Class SM ,Class UHSSize (in) : 5/8 (16mm) 3/4 (19mm) 7/8 (22mm) 1 (25mm) 1-1/8 (28mm)Now .we provide sucker rod couplings to USA ,Argentine ,Pertu, India ,Indonesia ,Kuwait.... API Type T Couplings