Millennium Marking Economy Automatic Consecutive Numbering Machine - 6 Wheel (MX-09940) 6 wheels allow for numbers to range from 000000 to 999999 Self-inking stamp improves productivity 5 actions include consecutive numbering, duplicate numbering, triplicate numbering, quadruplicate numbering and quintuplicate numbering Strong metal frame provides the durability to imprint thousands of documents with confidence and dependability Characters are 3/16" high and surface area of the entire impression is 3/4" wide