How many inches is the security card photo?

Two inches and one inch. Official website information of the National Vocational Qualification Network shows that the security guard certificate is issued by the Ministry of Public Security, that is, the security guard employment certificate and the security guard professional qualification certificate issued by Ministry of Human Resources and Social Security. The requirements for handling the security guard certificate are 1 2-inch blue background photos, 2-inch blue background photos, and the security guard certificate photo receipt, with the photo size of 8.56cm×5.40cm.