... ,L/C, Western unionDelivery termsBy sea or by airDelivery timeWithin 3 to 7 daysMarketCanada, USA, Middle east ,Africa, EuropeApplicationPetroleum & gas ... diameters and high projection. This cutting structure design, combined with maximum cone offset, results in high bit penetration rates. ... rubber O-ring provides adequate sealing for bearing durability. 3 1/2"-26" Kingdream water well reamer bit