API 5DP NC38 NC31 R1 R2 R3 drilling steel pipe /drill pipe /drill tube 

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Contact: Tina Zhang
Tianjin Boer King Steel IMP&EXP Co.,Ltd
Add: No.602,Shuanggang Development Zone,Tianjin,300350 China.
Tel: 0086-22-28577880
Fax: 0086-22-28577888
Cell :: 0086-15122870239