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 Contact: james861019@ gmail.com MSN: zhaojie-sky@ hotmail.com