[Size]: F6003-20/2RS(Inner Diameter: 20mm, Other Diameter: 35mm, Thickness: 11mm） [Durable]: Chrome Steel (52100) races offer high hardness and great wear resistance, thus extend bearings' service life. [Matetial]: The ABEC-3 ball bearings reduce your replacement frequency and maintenance costs,chrome steel for greater strength and durability. [Easy to Maintain]: Closed with double shields to protect the bearings from dust or other foreign matter, and has the features of small friction and high speed operation. [Application]: Suitable for use in household appliances, garden machinery, outdoor vehicles, electric toys and tools, industrial production and more. Material 52100 chrome steel Bearing number F6003-20/2RS Item thickness 11 m.