When drill super soft high pressure coal seam, diameter 90mm, 113mm, 133mm, 146mm will be recommended. It will be more convenient to lay and install core barrel. This kind of drill rod guarantees high efficiency of drilling work.
Good price auger screw drill stem use in mining, water well, geothermal,all kind of rock drilling.
Our Diameter 60-400mm Good price auger screw drill stem has many characters as below:
1) Stable performance
2) Long service life
3) High bending strength
