10 Shielded Bearing R166ZZ 3/16x3/8x1/8 inch Miniature BearingsR166ZZ Shielded Ball Bearings 3 16" x 3 8" x 1 8" inch Lot of 10 Bearings R166ZZ Shielded Ball Bearings, the inner diameter is 3 16", outer diameter is 3 8" and the width is 2 16", also bearings are pre lubricated with grease, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination. Item: R166ZZ Ball Bearings Type: Deep Groove Ball bearings Closures: 2 Metal Shields Lubrication: Self Lubricated (Grease)