1.HW Drill Pipe by weiling 2.Internal Upset Transit area 3.Equipped with Make &Break Machine,cold rolling of the threads The first place domestic sale,the top three place global sale 1.OD: 2 3/8", 2 7/8", 3 1/2", 4" ,4 1/2", 5", 5 1/2" ,6 5/82.Steel grade: E75,X95,G105,S135 3.Certificates : API 5DP,NS-1 4. Length: R1: 5.3-7.9m R2: 8.5-11.5m R3:11.5-14.5m 5.Internal Coating : TK34 , TC2000, TC3000 ...