The 44649 Bearings measure 1 1/16" inner diameter, each Bearing set comes with 2 44649 bearings for use on a 1 1/16" round straight trailer axle spindle. Bearings are typically maintained and replaced in pairs, so we've created this bundle of 2 sets of Bearings and Seals so that you can source and replace the bearings in your trailer's hubs with ease.