deep groove ball bearing Inch R series：R165,R166,R3,R3A,R168,R188,R4,R4A,R6,R8,R8-7with OPEN, ZZ, 2RS type, also has NR, NN type. The Inch Series products are widely used in vacuum cleaners, air conditioners, massage devices, garden electrical, electrical tools, motorcycles , automobile, waterproof pump , sport and toys , record equipment , medical equipment, computer, the High skate, skateboards, communicating devices and so on