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311.1MM IADC 517 TCI Tricone Bit 12 1/4 Inch For Hard Gypsum / Marble Basical Parameter Bit Size 12 1/4"(311.1MM) IADC Code 517 Connection 6 5/8"API reg pin Nozzle Qty 3NZ Make up Torque(KN.m) 16.3...