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5 5/8''inches Milled Tooth Tricone Drill Bit with 2 7/8 Reg Pin, Find Details and Price about Tricone Bit Steel Tooth Tricone Bit from 5 5/8''inches Milled Tooth Tricone Drill Bit with 2 7/8 Reg Pin - Hejian Hengji Bit Manufacture Co., Ltd.