PMC Supplies LLC 36 Pc 1/2" 12.5 mm Steel Stamps Punch Set For Stamping Metal Letter Alphabet Number Marking Gold Silver Bars Jewelry Marking Tool Stamps sets are great for stamping gold, sterling silver, gold bullion, and soft metals Made with black-coated carbon hardened steel Each set includes letters A-Z, numbers 0-9 along with the ampersand symbol (&) stored in a durable box