F A Q 1.WHY DO THE BEARINGS I RECEIVE HAVE SHAKING? The clearance of the bearing is related to the play. The default is the standard C0 clearance, which is usually 3-18um. The corresponding principle is shown in the figure below. If you don't need to shake, please choose C2 small clearance bearing, If you have any questions, please contact us before purchasing. 2.WHAT IS THE ACCURACY OF ABEC-1 ABEC is the American ANSI standard. The corresponding German DIN standard and international ISO standard are as follows: 3.DO YOU PROVIDE LOGISTICS TRACKING INFORMATION? Yes, all our products provide full logistics tracking, And the products you buy are all new. We will buy transportation insurance for you. If the product is damaged or lost during transportation, you can get paid.

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