중국드릴링 장비 및 예비 부품 제조 / 공급 업체,제공 품질 214mm Oil Well Drilling Bits Mining Rock Drill Bit for Well Drilling, 216mm Oil Well Drilling Bits TCI Bits Steel Tooth Bit for Water Well Drilling, 311mm Drill Tricone Bit Roller Cone Cutter TCI Bits for Well Drilling 등등.