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4 Blades 6 Inch 152mm PDC Bit /Diamond Drill Bit 1. PDC DRILL BITS - STANDARD CONNECTION SIZES BIT SIZE(INCH) API REGULAR PIN(INCH) RECOMMENDED MAKE UP TORQUE(KN.M) 4 1/2 to 4 3/4 2 7/8 API 6.0~7.5 5 ...