Texturing Hammer Crosshatch and Stars. Texturing hammers for non-ferrous metals. These double-sided hammers enable the you to make attractive patterns to give jewellery and other metal items a special look. Two different patterns on the hammer. Just place sheet metal on a flat metal block or anvil and strike sharply. In no time you will have interesting patterns.The hammer has a Rockwell hardness of 48, and the more the hammer is used, the more interesting the patterns become.