... widely used for oil&gas, water well, geotechnical, environmental, geothermal, construction, exploration and mining drilling. >BEARINGSPrecision bearings made with the tightest ... hard formationApplicationPetroleum & gas ,water well ,mining and tectonic industries ,oil field, construction, geothermal, directional boring, and underground foundation workPackageSeaworthy packing wooden case ...