... minimum. 4.Product ApplicationIt is suitable for mining applications. 5.Current Main Availability Diameter/InchIADC CODE3 1/2 211, 121, 241, 537…. ... 131, 211, 537, 517….15 1/2 211, 121, 241, 537….17 1/2 131, 211, 537, 517….18 1/2 211, 121, 241, 537….………..……………………………… ... 26 131, 211, 537, 517…. API standard 12 1/4''steel tooth tricone bi for water well or oil well ...