The Leonardo Crab Profile brass imprinter (brass stamp) has a pattern head of 13mm and has a 5 inch long handle. It can be used anywhere on a bead and are small enough that you can place a few imprints on a bead or just make small beads for sets or even head pins. The sample imprint looks different on various colors of glass. We are currently designing new patterns and will offer them when available. The imprint tool designs are original and owned by Leonardo Lampwork. Custom made here in America. They have been tested for durability, quality and excellence. Sample not included.