55 mm x 100 mm x 21 mm SKF 6211-2ZNR deep groove ball bearings

LET OUR 55 mm x 100 mm x 21 mm SKF 6211-2ZNR deep groove ball bearings EXPERTS 55 mm x 100 mm x 21 mm GET YOU NTN BEARING CORP.OF AMERICA THE Steel Bearing Material PARTS YOU NEED.

What is 6211-2ZNR bearing interchange？