623ZZ Bearing 3x10x4 Shielded Miniature623ZZ Shielded Ball Bearings 3mm x 10mm x 4mm 623ZZ ball bearing has 2 metal shields to protect the bearing from dust or any possible contamination, inner diameter is 3mm, outer diameter is 10mm and width is 4mm. Item: 623ZZ Ball Bearing Type: Deep Groove Ball Bearing Material: Chrome Steel Dimensions: 3mm x 10mm x 4mm Metric ID (inner diameter) Bore: 3mm OD (outer diameter): 10mm Width Height thickness: 4mm Size: 3 x 10 x 4 mm Quantity: One Bearing