VB025CP0 Thin Section Ball Bearing 2 1/2" x 3 1/8" x 5/16" inch VB025CP0 Thin Section Steel Open Ball Bearing, VB025CP0 is ABEC 1 quality, VB025CP0 bearing is Oil Preservative preserved, inner diameter is 2 1/2" inch, outer diameter is 3 1/8" inch and width is 5/16" inch.