1.Sizes rang from 3 7/8" to 26" 2.Covers almost all IADC code. 3.Reliable ... ) Tricone BitsTCI tricone bit 1.Sizes rang from 3 7/8" to 26" 2.Covers almost all IADC code. 3.Reliable ... , 617G, 627G, 637G9 1/2241.3437G, 517G, 537G, 547G, 617G9 5/8244.5437G, 517G, 537G, 547G, 617G9 7/8250.8437G, 517G ... , 617G, 627G, 637G17 1/2444.5517G, 537G, 617G, 627G, 637G 5 7/8"TCI Tricone Bit