Hejian Huanyu Petroleum Machinery Co., Ltd.. We are specialized in drill bits,tricone bits,pdc diamond bits , drill pipe, Mud pump, stabilizers for water well, oil field, construction, geothermal, directional boring, and underground foundation work all over the world. Our purpose is to sell the best quality products and the lowest prices. (TCI bits, Milled steel tooth bits).: 8-1/2,9-1/2,12-1/4,15-1/2,17-1/2 We have been serving the drilling industry since 1998, we provide clients with quality drill bits ,drill pipe and related products. Regarding the drill bits, we can supply the sizes range from 6 to 26 with a large selection of both, new and used Rock bits, Show More