... carbide gear optimized design of the tooth row 17 1/2" tricone button bit 12 tci bits iadc 343.Cutting ... with new formulas and new techniques for insert bit. 2.Gauge StructureMultiple gauge protection with gauge trimmers on heel and ... 4311.1437, 517, 537,617,63717 1/2444.5517,537IADC CODE:112 121 131,127 ,137,215 216 217 ,311 ... 4,14 3/4,14 5/8,16,17 1/2,20,22,23 ,24,265.Basic Information Product/Service ...