1.OD:2 3/8"-6 5/8" 2.Grade:E, ... ,EU,IEU 4.HB:Arnco100XT,150XT,300XT, Botn1000,3000 5.IPC:TC2000,TK34 For more than 40 years, we've been ... produced in accordance to Standards of API 5DP, API7 &7-1, NS-1. RUSSIA RTN, RUSSIA GOST-R, ISO 9001,ISO 14001 ... , Arnco Hardbanding Certificates and so on. 2 3/8--5 1/2 drill pipe