AW MACK 6688 LETTERING DIE A-M NEW Each of these tough dies is constructed from hardened steel and produces a crisp, clear, highly legible 3/16 inch figures for identification that's practically indelible on tools, lead cable tags or stubs. The numbering die roller has 0-9, X and -. The lettering die include A-M on one roller and N-Z on the other. Overall length of each die is 3 5/8 inches.