The reason why the hair screws are fastened by an electric screwdriver is the reason for the screwdriver head
Is the electric screwdriver, hair or screw hair, and in general, screw hair, that is, the screwdriver sleeve on the set to the screw is not fully consistent, start
There is the tool does not stop completely, when rotating, remove the sleeve and other tools, usually at the beginning of the operation and at the end of the incorrect operation caused
