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Zhongcheng Drill Bit Manufacture Co., Ltd. just posted IADC537 12 1/4 TCI tricone roller rock bits      Changzhou Cbaner Hardware Tools Co., Ltd. just posted China manufacturer HRC55 carbide square end mills, China High performance carbide drill bits with coolant hole      Zhongcheng Drill Bit Manufacture Co., Ltd. just posted 5 blades 17 1/2 inch PDC Bit      

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