The American Perforator 400-7 seven digit security perforator imprints up to seven digits into reports, checks, statements and more. The seventh place is primarily used for additional specifity. One of the most popular and longest lasting security perforators still around, this model continues to be used for code-numbering data and for numerical identification of all types of documents. The number and code numbers can be used for labels, applying expiration dates, i.d. tags, and more.