1.OD:2 3/8"-6 5/8" 2.Grade:E,X,G, ... various oil drilling tools including Drill Pipe, Drill Collar, Heavy Weight Drill Pipe, Kelly,Pup Joint and so on ... accordance to Standards of API 5DP, API7 &7-1, NS-1. RUSSIA RTN, RUSSIA GOST-R, ISO 9001, ... ISO 14001, OHSAS 18001, Arnco Hardbanding Certificates and so on. 2 3/8--5 1 ... /2 drill pipe