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Hejian Hengchang Drilling Supplies Marketing Dept.
PDC bit, TCI bit, tricone bit, blade bit, drill collar, drill rod,
 
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inserted tricone bit for water well drilling
tci roller bit,steel tooth roller bit 1certified by ISO9001API 2Reliable bearing system 3all teeth are harden 4all sizes
steel tooth cone bits
steel tooth bit,steel tooth tricone bit, steel tooth roller bitFor soft to medium formation drillingcertified by API
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