The Chinese names of 30x50mm, 50x 100mm, 50x50mm and 70 x 70 mm automobile vin plates are vehicle identification codes. Perhaps you have noticed that there is an additional code consisting of 17 letters and numbers on the nameplate of the vehicle around you, which is the VIN of the vehicle, which is also commonly known as 17 identification code. Vehicle identification codes can be arranged and combined, so that vehicles produced within 30 years will not have duplicate numbers, just as our ID cards will not have duplicate numbers, and they have the unique identification of vehicles, so some people call them "automobile ID cards". The vehicle identification number contains information about the manufacturer, year of production, model, body type, engine and other equipment of the vehicle.