Size of punched numbers Letters, numbers and symbols are approximately 6mm in diameter. 37 letter punch of 6mm includes 26 capital letters from A to Z , the numbers 0 to 8 (6 and 9 are interchangeable) and the symbols "&" and "". DURABLE MATERIAL The striking numbers and letters are made of high quality iron for strength and hardness. These attributes reduce the wear and feel of metal punches with numbers and letters for durability. Custom Letter Punches Personalize your crafts, jewelry, cards , your leather ornaments and more with the letter and number stamping kit. Metal Punch is a handy tool set for craft lovers. Wide Application The 6mm digital hole punch is ideal for printing on materials such as metal, plastic, leather and wooden objects. The surface of the metal pad set may contain oil, which can prevent rust. Note: The data is all measured by hand, please allow some 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual product received shall prevail. )