1.Reliable bearing system 2.Fast drilling rate 3..size rang ... (HJ),rubber sealed(HA), not sealed(W) Circulation system Mud pumpModelTCI BIT, STEEL TOOTH BIT IADC CODE 116 ... daysMarketCanada, USA, Middle east ,Africa, EuropeApplicationPetroleum & gas ,water well ,mining and tectonic industries ,oil field, construction, geothermal, directional ... durability. 3 1/2"-26" Kingdream water well reamer bit