R156ZZS Miniature Shielded Bearing 3/16" x 5/16" x 1/8"R156ZZS Shielded Ball Bearing 3 16" x 5 16" x 1 8" inch R156ZZS Shielded Ball Bearing, a standard bearing size commonly used in a variety of industrial and commercial applications, measures an inner diameter of 3 16" inch, outer diameter is 5 16" inch and the width is 1 8" inch, 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. R156 ZZS Ball Bearing Deep Groove