Deep Groove Metric Ball Bearing - Metal Shielded 30mm x 55mm x 13mm Deep groove ball bearings are particularly versatile. They are suitable for high and very high speeds, accommodate radial and axial loads in both directions and require little maintenance. Deep groove ball bearings are the most widely used bearing. • Inside Diameter 30mm • Outside Diameter 55mm • Width 13mm • Metal Shielded • Chrome Steel • Weight 140 gms