Package Include: You will get 4pcs bike ball bearings, 5/32" x 20 Balls.
Size: Outer diameter is 40mm/ 1.57inch, inner diameter is 33mm/ 1.3inch, ball diameter 0.157inch/4mm. Please be sure to verify the size before you order the ball bearing.
Function: The bike ball bearing can be used for bicycle headset crank bearing replacement, and fit your bike's drivetrain components. You can regularly check and replace your bicycle bearing before cycling or bicycle race.
Suitable for replacing bicycle frmame/fork crank bearings, suitable for ordinary bicycles mountain bikes