8 1/2 Inch TCI Rock Bits for Well Drilling Beijing Superior Drilling Equipment Co., Ltd. Base Info Model NO.:8 1,2 IADC 617Customized:CustomizedStandard:JIS, AISI, APIType:Core Drill BitMaterial:Solid CarbideUsage:Well DrillingTrademark:SuperiorTransport Package:Wooden BoxOrigin:Hebei Description Pre:Trencher Cutter Teeth Round Shank Cutter Pick for Coal Mining Next:Roller Cone Bit Single Type