45 mm x 85 mm x 19 mm ISO NU209 cylindrical roller bearings

ISO Bearing Shandong Chik Bearing Co., Ltd. offers a 45 mm x 85 mm x 19 mm ISO NU209 cylindrical roller bearings selection 13.8 mm Lw of Genuine ISO Bearing at Wholesale Prices. We are 45 mm x 85 mm x 19 mm a 45 mm x 85 mm x 19 mm ISO NU209 cylindrical roller bearings Certified Parts Retailer

What is NU209 bearing cross reference？