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Drill bit is to promote the coal ministry has the list of product, the hardness is divided into two categories, type I is suitable for soft rock drilling, type â…± is suitable for hard rock and hard rock drilling. Type: divided into dry type and wet type. Specification: 282, 322, 422 features: fast drilling, wide drilling range, save time,save labour, simple connecting method, durable and so on.
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Jining, Shandong