Consider one of these numbering machines if you are looking for a numbering stamp that automatically advances to the next numeral. All numbering machines are self-inking with your choice of black or red ink. Additional pads and special numbering machine ink is available. Machines with 6 numbering wheels can perform a number of functions: the machine can be locked so that it imprints the same number repeatedly; the machine can also be set so that it moves to the next consecutive number after every imprint; or you have the option of setting the machine so that it will repeat the same number 2 times, 3 times, 4 times, 5 times, 6 times or 12 times before advancing to the next number. Machines with 7 and 8 numbering wheels perform as the 6 wheel machines except the same number can be stamped repeatedly, consecutively, 2 times, 3 times or 6 times before advancing to the next number. For numbering and a date notation, we offer two models: Model 307-NG features 6 numbering wheels that imprint before the date and Model 307-DG imprints the date before 6 numbering wheels. Both models can be locked so that the numbering wheels imprint the same number repeatedly; the machine can also be set so that the numbering wheels move to the next consecutive number after every imprint; or it can be set so that the numbering wheels repeat the same number 2 times, 3 times, or 4 times before advancing to the next number. If you need a letter notation followed by 5 numbering wheels, choose Model B6-A for letters A through J; choose Model B6-K for letters K through T; or choose Model B6-S for letters S through Z. All numbering machines have die cast metal alloy wheels and print 3/16" characters.