... ). High quality and competitive price 2). many years experience in well drilling equipments Available sizes:4 5/8"(118mm), 5 7 ... 7/8"(200mm),8 1/2"(215.9mm), 9 1/2"(241mm),9 5/8"(245mm), 11 5/8"(295mm),12 1 ... steel, carbideDelivery termsBy sea or by airapplicationPetroleum and gas, water well, mining and tectonic industries, oil field, construction, geothermal, directional boring ...