API Tubing coupling:
Size range from 2-3/8" to 4-1/2"
EUE or NUE
Steel grade including J55/K55, N80, L80, P110

API Casing coupling:
Size rang from 4-1/2" to 13-3/8"
Thread type: STC, LTC, BTC
Steel grade including J55/K55, N80, L80, P110