... .MOQ: one piece 4.The best price and delivery. 1.Cutting structureThe durability of premium tungsten carbide insert is improved ... 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 ... 131, 211, 537, 517….6 211, 121, 241, 537…. 12 1/2 211, 121, 241, 537….14 3/4 131, 211, ...