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Expansion Drill Bit
Expansion Drill Bit
Name︰Expansion Drill Bit
Model No.︰FWKJ
Brand Name︰JINSHUO
Country of Origin︰China
Unit Price︰CNY ¥ 2800 / pc
Minimum Order︰100 pc

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Product Description
First,suited to drill small hole ,then drill large hole which can reduce  the cutting edge and rock hole section,and reslove the slow speed of large-scale bits drilling in the hard rock formation.
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Expansion Drill Bit
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