Feature:1. 10 Pcs: This set contains 10 pcs deep grooves ball bearings, the inner diameter is 12mm, the outer diameter is 21mm, and the thickness is 5mm2. High Speed: This lever bearing has simple configuration, features high speed, low friction coefficient, low vibration and noise3. Double Shielded: The ball bearing is double shielded, has steel dust shielding on both sides to prevent dust and contaminants from entering4. Wear Resistant and Durable: The ball bearings have uniform hardness, resistant to wear and high temperature, has long last durability5. Wide Usage: The double shielded bearing is suitable for various industrial equipment, micro motor, small rotating motor, office equipment, etc.Specification:Item Type: Deep Grooves Ball BearingBearing Material: Bearing SteelModel: 6801ZInner Diameter: Approx.12mm/0.5inOuter Diameter: Approx.21mm/0.8inThickness: Approx.5mm/0.2inUse Feature: High SpeedRolling Body Columns: Single columnRaceway Type: Deep grooving racewayRolling Body Type: BallAngle: 15 degreeSealing Cover: Double sided sealingRolling Body: Steel ball.Package List:10 xDeep Grooves Ball Bearing