Rock Drilling Bit 17 1/2 Inch Tri-Cone IADC537 Beijing Superior Drilling Equipment Co., Ltd. Base Info Model NO.:17 1,2 inchCustomized:CustomizedStandard:AISI, APIMaterial:Tungsten CarbideUsage:Well DrillingTrademark:SuperiorTransport Package:Wooden BoxOrigin:ChinaHS Code:8207199000 Description Pre:444.5mm Factory Supply TCI Tricone Bits & Oil Drill Tools with Great Price Next:IADC517 8 1/2" Insert Bit Reliable Quality Wear Resistant Factory New Sealed Bearing Oil Well Drilling TCI Tricone Rock Bits