Metal Stamping Punch. Contemporary Series Heart Outline Design. Customize Any Metal Blank. 1 Tool. Stamp any flat, soft metal. Use this punch to personalize metal blanks (made from non-ferrous metals such as Sterling Silver, Copper, Vintaj Natural brass and more). 6mm (1/4 Inch) height design. Made of tempered steel for years of service. Use with a metal bench block or anvil and a 16 ounce flat head hammer. Hold your blank in place on a bench block using simple masking tape. The masking tape can also act as a guide to assure your design is in the right spot. Measurements: Punch is 3" in length. Design height for this piece is approximately 6mm (1/4 Inch). Quantity: 1 stamp in one pattern.