50-Pack R166ZZ Bearings 3/16" x 3/8" x 1/8" Miniature BearingsLot of 50 Bearings R166 ZZ 3 16" x 3 8" Ball Bearings High Quality. ( Lot Of 50 ) inch size Ball Bearings, they are used in many applications, measures an inner diameter of 3 16", outer diameter is 3 8" and the width is 2 16", 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