10-Pack Shielded Flanged Bearings FR4ZZ 1/4" x 5/8" Miniature BearingsFR4ZZ Flanged Shielded Ball Bearings 1 4" x 5 8" x . 196" inch Lot of 10 Bearings FR4ZZ Flanged Shielded Ball Bearings, measures an inner diameter of 1 4", outer diameter is 5 8" and the width is 0. 196", a standard bearing size commonly used in a variety of industrial and commercial applications, each Comes with double metal shields (ZZ) to keep out dust and dirt, additionally, these bearings come pre lubricated with grease for smooth operation.