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Milled Teeth Bit The TCI bits are used to drill low compressive strength, very soft formations.TCI bits maximize the use of both conical and chisel tungsten carbide inserts of large diameters and high projection. This cutting structure design, combined with maximum cone offset, result in high bit penetration rates. The deep intermesh of cutter rows prevents bit bailing in sticky formation. Hejian Fanglei Drill Equipment Co., Ltd was founded in 1990, and is one of the most professional companies that specilizes in the drilling equipment. We can supply a large quantity of new and used pdc bits, tricone bits, drill pipe and drill collar etc, and various size is available. Besides, the goods have good quality and reasonable price you are interested in drill bits, please contact me now for a long time. We are waiting for cooperating with you and your company sincerely.