55 mm x 72 mm x 9 mm NSK 6811ZZ deep groove ball bearings

55x72x9 bearing offers a 47.6 mm Dimension H1 55 mm x 72 mm x 9 mm NSK 6811ZZ deep groove ball bearings selection 55 mm x 72 mm x 9 mm 14.0 mm Dimension N1 of Genuine 55x72x9 bearing at Wholesale Prices. We are a 55 mm x 72 mm x 9 mm NSK 6811ZZ deep groove ball bearings Certified Parts Retailer

What is 6811ZZ bearing interchange？