BearingsWith this one, you can replace your bike parts yourself at home.Keep your bike away from abnormal noise and drive more smoothlyThe perfect supply for bike enthusiasts and essential parts for your bike.Item: 3801-2RSClosures: RS SealedStructure: MAX, Double Row Full Balls, NO Retainer.Dimensions: 12 x 21 x 7 mmID (inner diameter): 12 mmOD (outer diameter): 21 mmWidth: 7 mmQuantity: 1 Lot = 4 PC