... Cover all all IADC code Certified by ISO9001&API 13 3/4 TCI tricone bit IADC417IADC417 TCI tricone bit INTRODUCTION1. Sealed roller ... , 617G, 627G, 637G9 1/2241.3437G, 517G, 537G, 547G, 617G9 5/8244.5437G, 517G, 537G, 547G, 617G9 7/8250.8437G, 517G ... 526 537 547 516 536 535available sizes:From 2 7/8 to 26”larger sizes for hole opener bit ,reamer bitadvantagemost ...