... /8" to 26" . 2.Reliable bearing and lubrication system 3.MOQ: one piece 4.The best price and delivery. Detailed Product Description Sizes ... , 241, 537….……….. ………………………………12 1/2 211, 121, 241, 537….14 3/4 131, 211, 537, 517….15 1/2 211, 121, 241 ... , 121, 241, 537….………..………………………………26 131, 211, 537, 517…. API standard 12 1/4''steel tooth tricone bi for water well or oil ...