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Description: Miniature ball bearing is available ball bearing of small size. This miniature ball bearings has a 8mm inner diameter, a 22mm outer diameter and a 7mm thickness. Ball bearing of this size is great for precision work and applications that require a lot of functional mechanical parts, such as mechanical equipment, electrical instrument, toy, door and window. Specifications: Material: Bearing steel(races), ceramic(balls) Inner Diameter: 8mm / 0.31" Outer Diameter: 22mm / 0.86" Thickness: 7mm / 0.27" Package Includes: 1 × Bearing