WOB69 ZZX Shielded Miniature Bearing 5/64" x 1/4" x 9/64"WOB69ZZX Ball Bearing 5 64" x 1 4" x 9 64" One Bearing High Quality WOB69ZZX the inner diameter is 5 64", outer diameter is 1 4" and the width is 9 64", a standard bearing size commonly used in a variety of industrial and commercial applications, made from durable 52100 alloy steel, commonly known as chrome steel each Comes with double metal shields (ZZ) to keep out dust and dirt, plus its pre lubricated with grease so its ready to roll right away.