Large bearing tapered roller axle bearing for all rearend applications that use the 3.150" O.D. x 1.771" or 45mm I.D. axle bearing journal. Includes 1 bearing, 1 bearing race, 1 bearing grease seal, and 1 bearing retaining collar. Sold as 1 set of the 4 mentioned pieces. We use this bearing in our Jeep JK Currie® semi-floating rearend applications.