... lubrication system 3.MOQ: one piece 4.The best price and delivery. 1.Cutting structureThe durability of premium tungsten carbide ... 131, 211, 537, 517….4 1/2 211, 121, 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, 211, 537, 517….15 1/2 211, 121, 241 ...