Spring Well Drilling Tricone Bit 13 5/8 Inch Beijing Superior Drilling Equipment Co., Ltd. Base Info Model NO.:IADC517Customized:CustomizedStandard:APILength:Taper-lengthType:Center Drill BitMaterial:Tungsten CarbideUsage:Well DrillingTrademark:superiorTransport Package:Woodern BoxOrigin:Hebei Description Pre:121/4"Tricone Bit Manufacture in China Next:TCI Type 115/8 Tricone Bit for Water Well Drilling