Size of Punch Numbers The alphabet, number and symbol are approximately 3mm in diameter, letter punches are 6mm wide and 60mm long. 37 Pieces Letter Punches3mm letter punch includes 26 uppercase letters A-Z, numbers 0-8 (6 and 9 are interchangeable) and "&" symbols and Durable MaterialNumber and letter punch are made from high quality iron for added strength and hardness. These attributes reduce wear and ensure the durability of metal punches with numbers and letters. Personalize Letter PunchUse letter and number stamping kits, personalize your crafts, jewelry, cards, leather decorations, etc. . Metal Stamping Punch is a handy tool set for craft enthusiasts. Wide Application3mm Number Punching Punch is very suitable for printing on materials such as metals, plastics, plastics, etc. leather and wooden objects. The surface of the Metal Stamp Set may contain oil which protects it from rust.