BOWER sells R4. Related information about R4 includes: Model R4 Inner diameter: 6.35 mm Outer diameter: 15.875 mm Thickness: 4.978 mm Series: Deep groove ball bearing. If you want to know more about R4 related information, you can consult online or call the hotline , we will serve you in detail. R4 has a wide range of uses. R4 is mainly used in engineering machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electric power, railways and other industries. The price of R4 sold by our company is reasonable and we look forward to cooperating with you.