Beaducation Spiral Metal Design Stamp, 5mm Circle Swirl Punch Stamping Tool Hand Stamped DIY Jewelry Crafts Original Metal Design Stamps Metal Stamp Spiral 5mm Design measures 5mm wide by 5mm high. Made from 3/8" square heat-treated tool steel. Beaducation Original Design. Made in the USA. Made to stamp on typical jewelry making soft metals, such as sterling, gold filled, copper, brass, pewter etc. Do not use on stainless steel.