... and lubrication system 3.MOQ: one piece 4.The best price and delivery. Detailed Product Description ... the probability of cone-dropping to minimum. 4.Product ApplicationIt is suitable for mining applications. ... , 211, 537, 517….4 1/2 211, 121, 241, 537….4 3/4 131, 211, 537, ... 1/2 211, 121, 241, 537….14 3/4 131, 211, 537, 517….15 1/2 211, ... , 517…. API standard 12 1/4''steel tooth tricone bi for water well ...