Assemblely Tricone Bit Used for Vertical Drilling Beijing Superior Drilling Equipment Co., Ltd. Base Info Model NO.:8 1,2 IADC 537Customized:CustomizedStandard:JIS, AISI, APIType:Core Drill BitMaterial:Solid CarbideUsage:Well DrillingTrademark:SuperiorTransport Package:Wooden BoxOrigin:Hebei Description Pre:8 1/2" 215.9mm Rotary Tricone Bit for Water Well Drilling Next:11 5/8 Inch 217 Steel Tooth & Milled Tooth Tricone Bit