Suitable for special drilling operation in soft to medium soft formations (f =1~5). ● Features Carbide bits have a simple structure with low operation cost and high drilling efficiency. ● Sizes Ordinary steel bits: Φ75, Φ94, Φ113, Φ133, Φ153 Plug-in type of casted steel spiral bits:Φ75~Φ150 (For special drilling operation of gas drainage boreholes in the coal seam) Large diameter bits for rescue: Φ300, Φ450, Φ600 ( Specially for across roadway and rescue borehole drilling operations). Drill Bits for sale website:http://www.xianccteg.com/drill-bits/
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