Features: _x000D_ 1. This ball thrust bearing set features high precision, high speed, and wear small. _x000D_ 2. Small frictional resistance, low power consumption, high mechanical efficiency. _x000D_ 3. High grade steel ball, quiet and smooth rotation at a high speed. _x000D_ 4. Small internal clearance and high machining precision. _x000D_ 5. Suitable for machinery manufacturing, equipment installation and maintenance. _x000D_ _x000D_ Specification: _x000D_ Condition: 100% Brand New _x000D_ Item Type: Thrust Bearing _x000D_ Bearing Material: Bearing Steel _x000D_ Optional Models & Sizes: F9-20M, F10-18M, F12-21M _x000D_ F9-20M: _x000D_ Inner Wheel Inner Diameter: Approx. Approx. 9mm / 0.4in _x000D_ Inner Wheel Outer Diameter: Approx. 19.8mm / 0.78in _x000D_ Outer Wheel Outer Diameter: Approx. 20mm / 0.8in _x000D_ Outer Wheel Inner Diameter: Approx. 9.2mm / 0.36in _x000D_ F10-18M : _x000D_ Inner Wheel Inner Diameter: Approx. 10mm / 0.4in _x000D_ Inner Wheel Outer Diameter: Approx. 17.8mm / 0.7in _x000D_ Outer Wheel Outer Diameter: Approx. 18mm / 0.7in _x000D_ Outer Wheel Inner Diameter: Approx. 10.2mm / 0.4in _x000D_ F12-21M: _x000D_ Inner Wheel Inner Diameter: Approx. 12mm / 0.5in _x000D_ Inner Wheel Outer Diameter: Approx. 21mm / 0.8in _x000D_ Outer Wheel Outer Diameter: Approx. 21mm / 0.8in _x000D_ Outer Wheel Inner Diameter: Approx. 12.2mm / 0.5in _x000D_ _x000D_ Package List: _x000D_ 10 x Thrust Bearing _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.