55 mm x 80 mm x 13 mm KOYO 6911 deep groove ball bearings

55x80x13 bearing offers a 55 mm x 80 mm x 13 mm KOYO 6911 deep groove ball bearings selection of Genuine 55 mm x 80 mm x 13 mm 55x80x13 bearing at N/A Minimum Buy Quantity Wholesale Prices. We are a 55 mm x 80 mm x 13 mm KOYO 6911 deep groove ball bearings 0.0 Inventory Certified Parts Retailer

What is 6911 bearing cross reference？