... Detailed Product Description Sizes range from 3 7/8" to 26" . Reliable bearing and lubrication system1.Cutting Structure The durability ... minimum. 4.Product ApplicationIt is suitable for mining applications. 5.Current Main Availability Diameter/InchIADC CODE3 1/2 211, 121 ... 211, 537, 517….18 1/2 211, 121, 241, 537….………..………………………………26 131, 211, 537, 517…. API standard 17.5'' sealed steel tooth tricone ...