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Russian 30 mm 32 mm 2 Wing or 3 Wing PDC Roof Bolt Drill Bit for Coal Mine, Find Details and Price about PDC Drill Bit 3 Wings PDC Drill Bit from Russian 30 mm 32 mm 2 Wing or 3 Wing PDC Roof Bolt Drill Bit for Coal Mine - Hunan Hippo Drilling Tool Co., Ltd.