the φ32 word wind the drill the φ34 word wind drill the φ36 word air drill of φ38 wind bit 
 A font cross-shaped air drill air drill specifications: 25,27,28,29,30,32,36,42 

 PDC cutter in the drill soft to medium hard rock (f ≤ 10), faster drilling rate, the life length of the column. Drilling - port hole high quality 
 Thereby reducing the waste of the drug volume Anchor. Need to re-grinding to replace the drill bit, supporting efficiency, reduce labor. Coal bolting with mesh hole drilling, 
 Provided a strong guarantee for fast and efficient roadway excavation