... Advantage: 1> TCI tricone bit, steel teeth tricone bit,rock bit,milled tooth bit,tci bit,steel tooth bit2> Certified by ISO9001&API3 ... seal8> including drill rods,drill collar,rerun steel tooth bits, ,used drill bits stock,used mud ... the cone where inserts are severely worn. Tungsten carbide inserts are placed on cone top face ... , 537, 6176152.4517 TCI tricone bit rock bit drill bit steel tooth bit