... 2.Reliable bearing and lubrication system 3.MOQ: one piece 4.The best price and delivery. Detailed Product Description ... 4.Product ApplicationIt is suitable for mining applications. 5.Current Main Availability Diameter/InchIADC CODE3 1/2 211, ... 241, 537….4 3/4 131, 211, 537, 517….5 1/2 131, 211, 537, 517….6 211, 121, ... 26 131, 211, 537, 517…. API standard 17.5'' sealed steel tooth tricone bit