Timken Deep Groove Metric Ball Bearing 6304-2RSC3Deep Groove Metric Ball Bearing Rubber Sealed 20mm x 52mm x 15mmDeep 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 20mm Outside Diameter 52mm Width 15mm Rubber Sealed Chrome Steel Weight 160gms