... drilling Advantage: 1> TCI tricone bit, steel teeth tricone bit,rock bit,milled tooth bit,tci bit,steel tooth bit2> Certified by ISO9001 ... bit body, the bit has good gauge protection inserts on bit body, the bit has good gauge protection and up drill capability3> Bearing StructureHigh precision ... of the bearing are improved. Compared with three cone bit, the leg bearing is bigger, so it can receive ...