山西环界石油钻具制造有限公司
Exhibit Profile：
HJ main products: oil drilling tools including drill pipes, drill collars, non-magnetic drill collars, spiral drill collars, heavy weight drill pipes, kellys, tool joints, core tools, etc.
HJ main products: oil drilling tools including drill pipes, drill collars, non-magnetic drill collars, spiral drill collars, heavy weight drill pipes, kellys, tool joints, core tools, etc.
Website：http://www.huanjie.com.cn