Miniature Ball Bearing, Bearing Industry Number 608, Bore Diameter 8 mm, Closure Double Sealed, For Environment Oily/Greasy, Outer Ring Width 7 mm, Outside Diameter 22 mm, Ring Material Alloy Steel, Seal Type Contact, System of Measurement Metric, ABEC Rating 1, Ball Material Alloy Steel, Ball Material Grade AISI 52100, Bore Diameter Tolerance +0/- 0.008 mm, Cage Type Sealed, Dynamic Radial Load Capacity 740 lbf, Includes Retaining Ring No, Lubricant Material Polyrex EM