Shielded Ball Bearing 1/4" x 1/2" x 7/32" inch One Bearing 1/4" x 1/2" x 7/32" Shielded Stainless Steel With Flanged Ball Bearing, Bearing is made of Stainless Steel, inner diameter is 1/4" inch, outer diameter is 1/2" inch and width is 7/32" inch (5.55mm).