N/a manufacturer / supplier in China, offering API 7-1 Factory 12 1/4" Xmf Tri-Cone Bits for Water Well Drilling, API 7-1 Factory 9 1/2" Xmf TCI Drill Bits for Oil Well Drilling, API 7-1 8 1/2" Floating Bearing Rubber Seal Roller Cone Bits for Water Well Drilling and so on.