This electric brushless sander can not only configure a 6-inch Backplane, but also configure a 5-inch Backplane according to the customer's requirements. Similarly, we operate the speed of each gear for you, From the 1st gear, the speed is expected to be around 5000 Then convert 2 gears: the speed is around 6000 Okay, let's adjust it to 3 gear, the speed is around 7000 Then, the following is adjusted to 4 gears, the speed is 8000 Then we turn on the 5th gear, the speed is 9000 Finally, we look at the maximum gear, the speed can reach 10000