6422 Double row deep groove ball bearings Structure: Deep Groove Outside Model Number: Z,ZZ,RZ,2RZ,RS1,2RS1,N,NR,ZN,RZN Precision Rating: high quality Seals Type: seal Number of Row: Double Row material: chrome steel,carbon steel 6000/6001/6002/ 60036005/6006/6007/6008 6000Z/ 60001Z/6002Z/ 6003Z/ 6004Z/6005Z/ 6006Z/ 6007Z/6010Z 6000RS /6001RS/6002RS 6201 2RS/63012RS 6209 2RS 6301 /6302/6303/