This article comes from: http://www.longfeibit.com tricone rock bit cone drill bit factory Hejian Fei Drilling Co., Ltd. is a professional Health sales cone bit; tricone bit; oil drill; drill Rod; drilling accessories and other products of the enterprise, the company has a professional technical team and R & D team, drilling engineering team across the country to provide the best and most comprehensive service, customers are welcome to discuss cooperation! Contact: Yin Jingli Tel: 13730590389 Information released by the Changzhou gallop network