Miniature Ball Bearing, Bearing Industry Number 688, Bore Diameter 8 mm, Closure Double Shielded, Outer Ring Width 5 mm, Outside Diameter 16 mm, Ring Material Alloy Steel, System of Measurement Metric, Cage Material Steel, ABEC Rating 1, Cage Type Ribbon, Dynamic Radial Load Capacity 1,260 N, Fillet Radius 0.1 mm, Includes Retaining Ring No, Lubricant Material Grease.2 mm, Finish Chrome Plated, Flange Diameter 18 mm, Flange Thickness 1.