How big is the license plate screw hexagon nut?

Precautions for installing the number plate: (1) The front number plate is installed in the middle or right of the front end of the motor vehicle, and the rear number plate is installed in the middle or left of the rear end of the motor vehicle, which shall not affect the safe driving of the motor vehicle and the identification of the number plate; (b) The license plate shall be installed without any deformation and cover, horizontal and basically vertical to the ground, with a longitudinal included angle ≤15; (3) In addition to the number plates of temporary entry vehicles and temporary driving vehicles, when installing other motor vehicle number plates, at least two special sealing devices for unified number plates with licensing authority codes shall be fixed on each side. (d) When the number plate frame is used for auxiliary installation, the inner edge of the number plate frame is more than 5mm away from the character edge of the motor vehicle registration number. (five) temporary entry motor vehicle number plate and temporary driving number plate shall be placed on the right side of the front windshield, and the temporary entry motor vehicle number plate shall be carried with the vehicle.