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190MM TCI Tricone Rotary Rock Bit , 7 1/2 Inch Troller Cone Drill Bit Basical Parameter Bit Size 7 1/2"(190.5MM) IADC Code 537 Connection 4 1/2"API reg pin Nozzle Qty 3NZ Make up Torque(KN.m) 16.3~21...