The American Perforator 410 is a versatile unit designed for any purpose. In addition to dating, this electric perforator offers the added option of a changeable top-line perforation. Words, names, or any lettering of the customer's choice may be placed, or deleted from the line above the date. The custom word is accomplished by means of a matrix key. The machine comes with one matrix key, but additional keys have to be purchased for each additional word at $100 a key. Matrix keys usually contain 8 characters, but that can vary slightly depending on the character width. If necessary, the 410 will also accommodate fixed characters on the third line. Perforates up to 25 sheets at a time. Click on the "supplies" icon to view the most popular matrix keys.