Punch for imprinting on metal, or metal clay (before or after firing). Makes the .999FS symbol. (99.9 % pure silver, fine silver) Add prestige and value. Mark is about 2 x 4 mm across. Attention By law, you MUST NOT imprint this mark on jewellery that has an assayable metal content less than 99.5% silver. This mark is intended to designate items that are fine silver.