Features 10 Pcs: The deep grooves ball bearing set contains 10 pcs deep grooves ball bearings, the inner diameter is 12mm, the outer diameter is 21mm, and the thickness is 5mm. Professional Made: This lever bearing has simple configuration, features high speed, low friction coefficient, low vibration and noise. Double Shielded: The ball bearing is double shielded, has steel dust shielding on both sides to prevent dust and contaminants from entering. Exquisite Workmanship: The ball bearings have uniform hardness, resistant to wear and high temperature, has long last durability. Wide Applications: The double shielded bearing is suitable for various industrial equipment, micro motor, small rotating motor, office equipment, etc. Specification: Item Type: Deep Grooves Ball Bearing Bearing Material: Bearing Steel Model: 6801Z Inner Diameter: Approx.12mm/0.5in Outer Diameter: Approx.21mm/0.8in Thickness: Approx.5mm/0.2in Use Feature: High Speed Rolling Body Columns: Single column Raceway Type: Deep grooving raceway Rolling Body Type: Ball Angle: 15 degree Sealing Cover: Double sided sealing Rolling Body: Steel ball Package List: 10 x Deep Grooves Ball Bearing Package List 10 x Deep Grooves Ball Bearing