Hejian City Feilong Retop Rock Bit Manufacture Co Ltd, established in 1992 and located in Hebei Province of China, has evolved into an comprehensiveenterprise integrating production, R&D and distribution of tricone bits, PDC bitstrenchless drilling and rotary drilling tools. The subsidiaries include Beijing Feilong International Trade Co Ltd, BeijingSuperior Drilling Equipment Co, Ltd and Tricone Bits Machinery Co, Ltd. We arealways well serving customers from industries of oil gas drilling, mining ...