8 1/2" roller bits/IADC637

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Beijing Guangying Construction Machinery Co.,Ltd

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8 1/2" roller bits/IADC637

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8 1/2" roller bits/IADC637

8 1/2" roller bits used on 1800mm core barrel drilling bucket. 1. metal sealed bearing 2. working time: about100 hours 3. IADC:637 4. suitable to hard formations with high compressive strength, such ...

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