... in drill bit manufacture High quality& low price API 3"-26" Steel Tooth Bit for Well Drilling As the professional supplier ... 537 547 516 536 535available sizesFrom 2 7/8 “to 26”larger sizes for hole opener bit ,reamer bitadvantagemost favourable price ... protectionMaterialAlloy steel ,carbideMarketCanada, USA,Middle east ,Africa,Europe API 3"-26" Steel Tooth Bit for Well Drilling