1.Tungsten carbide insert bit, TCI bit, button bit 2.Sizes range from 3 7/8" to 26" . 3.Reliable bearing and lubrication sys 1 ... . Product ApplicationIt is suitable for mining applications. 5. Current Main Availability Diameter/InchIADC CODE3 1/2 211, 121, 241, 537….3 7 ... /4 131, 211, 537, 517….5 1/2 131, 211, 537, 517….6 211, 121, 241, 537….……….. ………………………………12 1/2 211, 121, 241, 537 ...