... high strength and toughness carbide gear optimized design of the tooth row 17 1/2" tricone button bit 12 tci bits iadc 343 ... .Cutting Structure1.The durability of premium tungsten carbide inserts is improved ... /8,4 1/2,4 5/8,5 1/2,6 ,6 1/2,6 3/4,7 7/8,8 1/2,8 3/4,9 1/2,9 ... 3/4,14 3/4,14 5/8,16,17 1/2,20,22,23 ,24,265.Basic Information Product/Service ( ...