... lubrication system. 1.Cutting structureThe durability of premium tungsten carbide insert is improved with new formulas and new techniques2. ... which reduces the probability of cone-dropping to minimum.4. Product ApplicationIt is suitable for mining applications.5 ... 8 131, 211, 537, 517….4 1/2 211, 121, 241, 537….4 3/4 131, 211, 537, 517…. ... 12 1/2 211, 121, 241, 537….14 3/4 131, 211, 537, 517….15 1/2 211, ...