... size range and various structure.2.Features : Shield / closure: open ball bearing, Z, ZZ, RS, 2RS,2RZBall bearings snap ring ... .Versions: Ball bearings with one or two side rubber seal RS, 2RS.With one or two side metal shields Z and ZZ ... Motor , Pump ,Fan,Air conditioner ,Microwave Oven,Range hood,Sewing machine,Massage Chairs,Textile machinery, Electric tools,Agriculture machinery ,Fitness equipment ...