... and delivery. Detailed Product Description Sizes range from 3 7/8" to 26" . Reliable bearing ... on the shirttail increases gauge holding capability. 3.Bearing Structure Air cooling roller bearing package. ... , 537….……….. ………………………………12 1/2 211, 121, 241, 537….14 3/4 131, 211, 537, 517….15 1/2 211, ... 537….………..………………………………26 131, 211, 537, 517…. API standard 12 1/4''steel tooth tricone bi for water well or ...