... sealed (HJ),rubber sealed(HA), not sealed(W) Circulation system Mud pumpModelTCI BIT, STEEL TOOTH BIT IADC CODE 116 117 126 ... 3 to 7 daysMarketCanada, USA, Middle east ,Africa, EuropeApplicationPetroleum & gas ,water well ,mining and tectonic industries ,oil field, construction, geothermal, directional boring ... adequate sealing for bearing durability. 3 1/2"-26" Kingdream water well reamer bit