81/2 TCI single roller cone for hole opener core barrel

size:81/2" roller cone IADC:537 Tooth type:TCI bearing:rubber sealed journal bearing application:hole opener for horizontal directional and vertical drilling, core barrel for bore pile drilling weight:15kg certificate:API7-1,SY/T5164,ISO9001:2008 Recommend rock formation: medium soft with low compressive strength and harder abrasive stringers,such as shale,hard gypsolyte,soft limestone,sandstone and dolomite with stringers,etc.

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