1.Sizes range from 3 7/8" to 26" . 2.Reliable bearing and lubrication ... and delivery. Detailed Product Description Sizes range from 3 7/8" to 26" . Reliable bearing and lubrication system1. ... for mining applications. 5.Current Main Availability Diameter/InchIADC CODE3 1/2 211, 121, 241, 537….3 7/8 131, 211, 537, 517….4 1 ... /2 211, 121, 241, 537….4 3/4 131, 211, 537, 517….5 1 ...