Features:_x000D_ 1. These bearings are made of high quality steel for low noise and long service life._x000D_ 2. They are double-sided rubber sealed to avoid contaminants entering and save lubricant._x000D_ 3. This section bearing feel smooth, low noise, long service life._x000D_ 4. Low frictional resistance and high speed. _x000D_ 5. With Stable characteristics, high reliability. _x000D_ _x000D_ Specification:_x000D_ Condition: 100% Brand New_x000D_ Item Type: Ball Bearings_x000D_ Model: 687-2RS/688-2RS/689-2RS (optional)_x000D_ Model Inner diameter Outer diameter Thickness _x000D_ 687-2RS 7mm / 0.28in 14mm / 0.55in 5mm / 0.2in _x000D_ 688-2RS 8mm / 0.31in 16mm / 0.63in 5mm / 0.2in _x000D_ 689-2RS 9mm / 0.35in 17mm / 0.67in 5mm / 0.2in _x000D_ Cage and Materials: Steel Plate_x000D_ Use Characteristics: High Speed_x000D_ Uses: General_x000D_ Number of Rolling Body Columns: Single Column_x000D_ Raceway Type: Deep Groove Raceway_x000D_ Bearing Material: Bearing Steel_x000D_ Rolling Body Type: Ball_x000D_ Angle: 15 degrees_x000D_ Sealing Cap: Double-sided seal_x000D_ Rolling Body: Steel Ball_x000D_ _x000D_ Package List:_x000D_ 10 * Ball Bearings_x000D_ _x000D_ Note:_x000D_ 1. Please allow slight error due to manual measurement. Thanks for your understanding._x000D_ 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.