Angular Contact Ball Bearing, Ball Material Alloy Steel, Bearing Industry Number 3304/5304, Bore Diameter 20 mm, Cage Material Polyamide, Closure Double Shielded, Contact Bearing Type Angular Contact, Lubricant Material SRI 2 Grease, Polyrex EM Grease, Matched Bearing Type Not Matched/Single Bearing, Maximum Speed 11,000 RPM, Maximum Temperature 175 Degrees C, Minimum Temperature -40 Degrees C, Number of Rows Two, Outside Diameter 52 mm, Overall Width 22.2 mm, Ring Material Alloy Steel