1.Reliable bearing system 2.Fast drilling rate 3..size rang from3"1/2-26" 4.Certification: API & ISO9001 5.delivery on time ... /2"(215.9mm), 9 1/2"(241.3mm), 12 1/4"(311mm) , 13 5/8"(346mm) , 14 5/8"(371mm), 15 ... termsBy sea or by airDelivery timeWithin 3 to 7 daysMarketCanada, USA, Middle east ,Africa, EuropeApplicationPetroleum & gas ,water well ,mining and tectonic industries ...