... one piece 4.The best price and delivery. 1.Cutting structureThe durability of premium tungsten carbide insert is ... Product ApplicationIt is suitable for mining applications.5. 5.Current Main AvailabilityDiameter/InchIADC CODE3 1/2 211, 121, 241, 537…. ... 241, 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, ...