... 8" to 26" . 3.Reliable bearing and lubrication sys 1.Cutting Structure The durability of premium tungsten carbide insert is ... mining applications. 5. Current Main Availability Diameter/InchIADC CODE3 1/2 211, 121, 241, 537….3 7/8 131 ... , 537….4 3/4 131, 211, 537, 517….5 1/2 131, 211, 537, 517….6 211, 121, 241 ... , 537….……….. ………………………………12 1/2 211, 121, 241, 537….14 3/4 131, 211 ...