1.OD:2 3/8"-6 5/8" 2.Grade:E,X,G,S 3.Upset:IU,EU,IEU 4.HB:Arnco100XT,150XT,300XT, Botn1000 ... 've been exploring and developing upon producing various oil drilling tools including Drill Pipe, Drill Collar, Heavy Weight Drill Pipe, Kelly ... produced in accordance to Standards of API 5DP, API7 &7-1, NS-1. RUSSIA RTN, RUSSIA GOST-R, ISO 9001,ISO 14001 ...