Many customers are very concerned about this problem. Currently, 95 percent of the customers in the market are using the manual brush because they are afraid that the machine is not stable enough to purchase. Our full automatic brush drill has been improved several times, and the test is quite stable now. As long as the machine is adjusted, it will be stable and stable without the adjustment of the machine. The anti-drill problem that the customer is worried about is basically not, this is the result that examines personally in the test. The problem of leakage is basically to reach the acceptable range, not every one, but the machine will inevitably leak a few in the operation, but the whole is harmless.