... soft ,hard, medium hard, very hard formationButton size (extra features)Button bit,saw teeth1) Y-Conical teeth 2) X-chisel teeth3 ... ,L/C, Western unionDelivery termsBy sea or by airDelivery timeWithin 3 to 7 daysMarketCanada, USA, Middle east ,Africa, EuropeApplicationPetroleum & gas , ... HSN rubber O-ring provides adequate sealing for bearing durability. 3 1/2"-26" Kingdream water well reamer bit