... experience in drill bit manufacture High quality& low price API 3"-26" Steel Tooth Bit for Well Drilling As the ... journal bearing) HA (rubber sealed journal bearingaircooled bearing typeFormation or layer soft ,medium soft ,hard,medium hard,very hard formationButton ... Gague protectionMaterialAlloy steel ,carbideMarketCanada, USA,Middle east ,Africa,Europe API 3"-26" Steel Tooth Bit for Well Drilling