... for mining applications.5. 5.Current Main AvailabilityDiameter/InchIADC CODE3 1/2 211, 121, 241, 537….3 7/8 131, 211, ... 537, 517….4 1/2 211, 121, 241, 537….4 3/4 131, 211, ... 537, 517….5 1/2 131, 211, 537, 517….6 211, 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….………..……………………………… ...