Simple direct punch, easy to use without a machine Made from carbon steel for durability and long service life Hardened for a clean and solid impression on the surface Shiny black oxidized finish for improved corrosion resistance Consists of 9 stamps, from digits 0 - 8 Invert number 6 stamp for a number 9 Equipped with a durable plastic storage box for easy carrying and storage Material Carbon Steel Type Number Punch Digit Size 1/4 In. Digit Size (Metric) 6mm