The Leonardo Concentric Circle brass imprinter (brass stamp) has a pattern head of 13mm and is 5 inches long. It can be used anywhere on a bead and are small enough that you can place a few imprints on a bead, texturize or just make small beads for sets or even head pins. There are 2 images of the tool showing 2 different angles. The sample imprint looks different on various colors of glass. We are currently designing new patterns and will offer them when available. The imprint designs are custom made here in America and have been tested for durability, quality and excellence. Bead not included.