Character height options: Available character heights include 2mm, 2.5mm, 3mm, 4mm, 5mm, and 6mm for standard characters; and 3mm, 4mm, 5mm, and 6mm for pockmarked characters. Bayonet ring diameter: The distance from the center of one bayonet ring to the center of the opposite bayonet ring measures 49.5mm. Back detail: The back of the unit includes 40 small round holes that correspond to each character, allowing for precise alignment during rotation adjustment to ensure accurate character positioning. Front character set: The set features 40 characters, comprising 10 numbers, 26 uppercase letters, and 4 common symbols. Note: Lowercase letters are not included. Specifically engineered for high-precision marking on metal surfaces, this tool is perfect for nameplates, tool markings, and more, making it an essential asset for machinery manufacturing, repair shops, and asset management., Manufacturer: LQZAXSRDR