1 mm, Finish Chrome Plated, Flange Diameter 10.Miniature Ball Bearing, Bearing Industry Number 684, Bore Diameter 4 mm, Closure Double Shielded, Outer Ring Width 4 mm, Outside Diameter 9 mm, Ring Material Stainless Steel, System of Measurement Metric, Cage Material Steel, Cage Type Crown, Ribbon, Dynamic Radial Load Capacity 641 N, Fillet Radius 0.3 mm, Flange Type Non-Flanged, Includes Retaining Ring No, Lubricant Material Grease.