38pc Automatic Letter and Number Stamping Metal Punch Stamp Set Tool Kit 3mm - 38 piece number and letter punch set Ideal to mark your name on metal, such as tools. They come in a blow moulded storage case to avoid misplacing them. Size of letters and numbers is 3mm The set contains 27 letter stamps (A-Z plus an & symbol) and numbers (0-8), The 6 can be used for a 9 also. The stamps have all been hardened and tempered. Simply place number or letter in the automatic punch and stamp where needed.