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3 Blades 4 Blades 5 Blades 6 Inch 6 1/2" Reg Thread Coreless PDC Bit for Soil Driling, Find Details and Price about PDC Drill Bit PDC Core Drill Bit from 3 Blades 4 Blades 5 Blades 6 Inch 6 1/2" Reg Thread Coreless PDC Bit for Soil Driling - Hunan Hippo Drilling Tool Co., Ltd.