8 1/2 Inch Tri-Cone Bit IADC 637 for HDD Rock Reamer Beijing Superior Drilling Equipment Co., Ltd. Base Info Model NO.：8 1,2 inchCustomized：CustomizedStandard：AISI, APIMaterial：Tungsten CarbideUsage：Well DrillingTrademark：SuperiorTransport Package：Wooden BoxOrigin：ChinaHS Code：8207199000 Description Pre：Water Well Borehole Drilling Tri-Cone Bit 5 5/8 Inch IADC 537 Next：6′ ′ TCI Bits for Very Hard Rocks
