... 3 7/8 to 26 Covers almost all IADC codes suitable for sidetracking, deep well drilling Advantage: 1> TCI tricone bit, steel teeth tricone bit,rock bit,milled tooth bit,tci bit,steel tooth ... .5517, 527, 537, 6174 3/4120.6517, 527, 537, 6175 7/8149.2517, 527, 537, 6176152.4517 TCI tricone bit rock bit drill bit steel tooth bit