10-Pack R168ZZ Shielded Bearings 1/4" x 3/8" x 1/8" MiniatureR168ZZ Ball Bearings 1 4" x 3 8" x 1 8" 10 Bearings 10 R168ZZ Shielded Ball Bearings, measures an inner diameter of 1 4", outer diameter is 3 8" and the width is 1 8", 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. R168ZZ Double Shielded Ball Bearings Deep