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