25mm * 55mm。 The standard size of the counter-sign column is 25mm * 55mm, because in domestic administrative organs, institutions and other organizations, the counter-sign column is usually used for the delivery, approval and signing of documents, and its size standardization can facilitate the circulation and preservation of documents. The countersignature column is the area signed by the person in charge of each professional type of work, and the professional, real name, signature and date of the countersignature personnel are filled in the column, as shown in General Format 5.