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6" PDC Core Drill Bits 1. Specification PDC Bit Specification Size IADC Blades Nozzles Cutter Size API PIN WOB RPM 6 1/2'' M332 5 5 13mm 3 1/2'' 10~110KN 60~220 8 1/2'' M323 5 5 16mm 4 1/2'' 10~110KN ...