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Brand Name:Hainaisen Model Number:9-1/2 HS95130C Place of Origin:China 9 1/2 Inch 5 Blades Carbide Insert Drill Bits Oil Well Drilling Bit 1. Rolling seal bearing structure, the cylindrical roller cone is in the groove, which increases the journal size. 2. Thrust bearing pairs are surface-treated and hardened respectively. 3.... |
Shaanxi Hainaisen Petroleum Technology Co.,Ltd
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