Bearing Open 8x19x4.5 Miniature8 x 19 x 4. 5 Open Ball Bearing One Bearing 8 x 19 x 4. 5 Open Ball bearing, inner diameter is 8mm, outer diameter is 19mm and width is 4. 5mm, Bearing is made of Chrome Steel. Item: 8 x 19 x 4. 5 Ball bearing Type: Deep Groove Ball Bearing Closures: Open Dimensions: 8mm x 19mm x 4. 5mm Metric ID (inner diameter) Bore: 8mm OD (outer diameter): 19mm Width Height thickness: 4. 5mm Size: 8 x 19 x 4. 5 mm Quantity: One Bearing