IADC437 537 637 Tricone Cutter Single Roller Cone Beijing Superior Drilling Equipment Co., Ltd. Base Info Model NO.:spa36Customized:CustomizedStandard:APILength:Stub-lengthType:Center Drill BitMaterial:Tungsten CarbideTrademark:SUPERIORTransport Package:Wooden CaseOrigin:ChinaHS Code:8207191000 Description Pre:HDD Drilling 17 1/2 " Reamer Roller Cones Next:8 1/2" IADC 537 Roller Cone Tricone Bit for Oil Well Drilling