... drilling Advantage: 1> TCI tricone bit, steel teeth tricone bit,rock bit,milled tooth bit,tci bit,steel tooth bit2> Certified by ... protection inserts on bit body, the bit has good gauge protection inserts on bit body, the bit has good gauge ... of the bearing are improved. Compared with three cone bit, the leg bearing is bigger, so it can ... , 527, 537, 6176152.4517 TCI single cone bit for hole boring