Item: R3ZZ Ball Bearing Neutral Type: Deep Groove Ball Bearing Shields: 2 Metal Shields Lubrication: Self Lubricated (Grease) Dimensions: 3/16" inch x 1/2" inch x 0.196" inch English Size ID (inner diameter)/Bore: 3/16" inch OD (outer diameter): 1/2" inch Width/Height/thickness: 0.196" inch Size: 3/16" x 1/2" x 0.196"