Deep Groove Metric Ball Bearing - Metal Shielded 55mm x 100mm x 21mm 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 55mm • Outside Diameter 100mm • Width 21mm • Metal Shielded • Chrome Steel • Weight 650gms