... 517 537 547 617 637 etcavailable sizes :From3 7/8 to 26”larger sizes for hole opener bit ,reamer bitadvantagemost favourable ... /C,Western unionDelivery termsBy sea or by airDelivery timeWithin 3 to 7 daysMarketCanada, USA,Middle east ,Africa,EuropeApplicationpetroleum&gas ,water well ...