... reduces the probability of cone-dropping to minimum. 4.Product ApplicationIt is suitable for mining applications. 5.Current Main Availability Diameter/InchIADC ... 131, 211, 537, 517….4 1/2 211, 121, 241, 537….4 3/4 131, 211, 537, 517….5 1/2 131, 211, 537, 517 ... , 241, 537….………..………………………………26 131, 211, 537, 517…. API standard 12 1/4''steel tooth tricone bi for water well or oil well drillng