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15 1/2'' IADC437 TCI Tricone Cone Chisel Bit Shallow and Deep Well Drill Bit, Find Details and Price about Tricone Bit TCI Bit from 15 1/2'' IADC437 TCI Tricone Cone Chisel Bit Shallow and Deep Well Drill Bit - Hejian Hengji Bit Manufacture Co., Ltd.